Malicious PDF — malware analysis report

Static analysis result for SHA-256 266798594ec91c9a…

MALICIOUS

PDF

41.8 KB Created: 2020-07-12 05:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 990e372ebc3ccebdfb155d5c732f8006 SHA-1: e07b0a59488563969fbf3bf2ed59a79caf6aefb2 SHA-256: 266798594ec91c9a21fe5971deeaa09e215dc114699ba5b0a88d3acf0d5938c8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to a link farm designed to host further PDF documents. One prominent link directs to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'TCS SAS interview questions and answers PDF', suggesting a lure to trick users into clicking the malicious links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=tcs%20sas%20interview%20questions%20and%20answers%20pdf In PDF document text
    • http://files.swimscaape.com/uploads/1/3/2/6/132695418/junibuvogo.pdfIn PDF document text
    • http://files.pvnewsguild.org/uploads/1/3/0/8/130873907/51c3043a91.pdfIn PDF document text
    • http://files.mortedomar.com/uploads/1/3/1/4/131453024/kitepiwi.pdfIn PDF document text
    • http://files.techniquejobs.com/uploads/1/3/1/3/131398540/gavov.pdfIn PDF document text
    • http://files.ntx.afaparents.org/uploads/1/3/0/8/130814161/kosoxi_vamedama_jitug_dodefifofemiju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jaxajuneko148236911.files.wordpress.com/2020/07/webanonotegajejozasana.pdfIn PDF document text
    • https://dunudojuzo.files.wordpress.com/2020/07/52500731788.pdfIn PDF document text
    • https://jadulotixen.files.wordpress.com/2020/06/nizuru.pdfIn PDF document text
    • https://petafasuja.files.wordpress.com/2020/07/sipovuzi.pdfIn PDF document text
    • https://zuxanevoxe.files.wordpress.com/2020/07/69539381424.pdfIn PDF document text
    • https://nuvosunogad.files.wordpress.com/2020/07/5871964441.pdfIn PDF document text
    • https://nalawerap212150830.files.wordpress.com/2020/07/26050610907.pdfIn PDF document text
    • https://xunewoweki.files.wordpress.com/2020/07/50935675747.pdfIn PDF document text
    • https://gadaxug.files.wordpress.com/2020/06/xebatejekatodawarusi.pdfIn PDF document text
    • https://tikurogeti.files.wordpress.com/2020/07/bawinovibesoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/73676382282.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/nitasadunojoniwuwamejumir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/95175420129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/34685129539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/58055245251.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5224 bytes
SHA-256: 54751c5f4a0db673e83aa52c61b86c22b70fee32fd95601b6256cbb80fd038c7
font_01_sfnt_off000074cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CF 11080 bytes
SHA-256: 6a33d3f04619687fcf8a63deebd0d66c222ff19f2f6c487066fad00e7dc1ed77