Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae3a6aeb4ab0aa4…

MALICIOUS

PDF

45.2 KB Created: 2020-08-02 22:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028d9bf2451e6e30b964eb10b132a50a SHA-1: 9cbc7ab98d9b88763320fe9f2bc4bcc163d7bf78 SHA-256: 7ae3a6aeb4ab0aa47e6b8f2f7901d70a060e562b3d541ee3e62e9e6b8e30ac70
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=dna%20structure%20worksheet%20answers%20key'. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a worksheet answer key, aligning with phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the malicious redirector strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=dna%20structure%20worksheet%20answers%20key
    • http://files.carlosalfredojr.com/uploads/1/3/0/7/130739654/8145433.pdf
    • http://files.markweaklandliteracy.com/uploads/1/3/0/9/130969429/bopajimo-furup-vuxoxelen-kukokasevakoxen.pdf
    • http://files.exotichemps.com/uploads/1/3/1/4/131454389/410e00eff40.pdf
    • http://files.jlbransford.com/uploads/1/3/1/0/131070799/vovefivogozi_luxupari.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/vuredojitirolazogejir.pdf
    • https://cdn.shopify.com/s/files/1/0438/9673/3864/files/zalub.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/23286212864.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/rifiwunedaripukiwube.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/15557246336.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/wogokevepiredulanedoje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/10134125002.pdf
    • https://cdn.shopify.com/s/files/1/0435/4595/2408/files/42701635705.pdf
    • https://cdn.shopify.com/s/files/1/0440/7446/7478/files/94426227923.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/33913366765.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/68269187558.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/blood_death_knight_best_in_slot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006592.bin
146f6fe8cbf7fd3ef641b654334cc7309868ffb3b0949f10d572db6b59c52388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 4948 bytes
font_01_sfnt_off00007671.bin
786fec089a1894d171df8242f8ec2d71d3b84a58249134af636ed75a633d9593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7671 10268 bytes
font_02_sfnt_off000099a1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99A1 4324 bytes

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