Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b565e5fb4200cdf…

MALICIOUS

PDF

41.0 KB Created: 2020-07-21 03:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 266a0c5ac1cc790b968e00b4d29f7db2 SHA-1: 3328286a010f8d112ccf94b686cb4f9018a00bac SHA-256: 8b565e5fb4200cdf3bc1c0d7f4dcc2804ad67b6ae70cad4c82631a1cc1eabc3d
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external links, characteristic of a link farm designed to obscure the true destination. The document body, though heavily obfuscated, suggests a lure related to 'high fiber foods pdf spanish'. The primary malicious IOC is the redirector URL, which is likely the entry point to a further stage of the attack.

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.cc/wb?keyword=high%20fiber%20foods%20pdf%20spanish In PDF document text
    • http://files.theplaidtraveler.com/uploads/1/3/1/4/131437823/9450648.pdfIn PDF document text
    • http://files.meadrdmardigras.org/uploads/1/3/1/1/131164440/7436554.pdfIn PDF document text
    • http://files.chenyy0527.com/uploads/1/3/2/7/132712139/lilogabewojumob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/kenepalovomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/256412680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/wazotexonibubapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4837/8266/files/felelatodoxasarubuteloneb.pdfIn PDF document text
    • https://piwelil.files.wordpress.com/2020/06/40894283391.pdfIn PDF document text
    • https://xodugunoku.files.wordpress.com/2020/06/fapijiduriver.pdfIn PDF document text
    • https://xifoburufo.files.wordpress.com/2020/06/54569364680.pdfIn PDF document text
    • https://pizeseguzog.files.wordpress.com/2020/07/tafenesixisake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/37065234307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8315/9969/files/74939982120.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/31285050434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/vasudetawelapuwewexakuvip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/kawedulatizatukotapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/nowutelududofik.pdfIn PDF document text
    • https://medlineplus.gov/dietaryfiber.htmlIn 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 8

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_off00006282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6282 5080 bytes
SHA-256: 69bf57826e1c97238ce90f62c2760af023edf06b66fa6f1ad811d1aff4886ef0
font_01_sfnt_off000073ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 10688 bytes
SHA-256: df14e63c8f4b7e2a8545a9748242397c81aa57e4e1b3153be080f544ef9c755d

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