Malicious PDF — malware analysis report

Static analysis result for SHA-256 703af905e58cad43…

MALICIOUS

PDF

44.6 KB Created: 2020-07-16 05:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 439312df2031afd17006a1bc1e8795dd SHA-1: a2d3548d4aaa7e3b56e3e27a133b6f93d3f356ff SHA-256: 703af905e58cad43ca4e9154ea544c8d35bcdfe0eb1d49ba54dc357c695ba66d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external PDFs, many of which are hosted on SEO-optimized domains and redirect to a malicious URL. The document body, though heavily obfuscated, suggests a lure related to "question paper pdf qmaths" to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to lead users to a compromised site.

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.com/wb?keyword=ssc%20cgl%202019%20question%20paper%20pdf%20qmaths In PDF document text
    • http://files.sgwknives.com/uploads/1/3/1/4/131408741/3186993.pdfIn PDF document text
    • http://files.fastvinylsigns.co.uk/uploads/1/3/0/8/130813732/e9f6eed78d.pdfIn PDF document text
    • http://files.5809yoga.com/uploads/1/3/2/6/132682093/dukilosakumedif-rafudumo-lovam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rijubunaji.files.wordpress.com/2020/06/78248582413.pdfIn PDF document text
    • https://dizuvas.files.wordpress.com/2020/07/fokufimigetena.pdfIn PDF document text
    • https://satugovanuw.files.wordpress.com/2020/07/40843275788.pdfIn PDF document text
    • https://fasukugon.files.wordpress.com/2020/07/93162961936.pdfIn PDF document text
    • https://dojobavoviz.files.wordpress.com/2020/06/mupijipelerebavexif.pdfIn PDF document text
    • https://gubajumopo.files.wordpress.com/2020/07/41847163135.pdfIn PDF document text
    • https://xifixab.files.wordpress.com/2020/07/67179196107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexivopagutufaxusezonav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/dofevabubiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/63572469489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/17843037521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutuxajaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/tasarajupididuvovavotisut.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C35 6160 bytes
SHA-256: 125d2549124887f646538c1df183825e21a72dfbe979bbe6d2898a9bf6ee4b79
font_01_sfnt_off000080e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E3 10744 bytes
SHA-256: 2bb39e484869d853048080251705e2c232e9f23f3ccca476d2e9ca4eba335acb

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