Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab8a40778d81199…

MALICIOUS

PDF

40.3 KB Created: 2020-08-14 00:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c009dd71fd1e672f059371a93693e25 SHA-1: 6edbc1fa7fc35d5c0a97cdc8dfd2d2f31437eb05 SHA-256: 9ab8a40778d81199c71bbc6d518c2bbbf95f24e82fc1f5d1232b0e9be57332df
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=glencoe+algebra+2+chapter+4+practice+answers'. Another heuristic indicated a PDF link farm with 16 external links, many hosted on cdn.shopify.com. The document body contains garbled text but also includes the same redirector URL and several shopify URLs, suggesting a coordinated effort to distribute malicious content through a link farm. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious sites or downloads.

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.ru/pify?keyword=glencoe+algebra+2+chapter+4+practice+answers
    • http://files.nlg-pros.com/uploads/1/3/2/6/132680994/8805085.pdf
    • http://files.cosmetictattoostudio.com/uploads/1/3/1/4/131453267/naxopof_zisape_palisiw_fonesemidux.pdf
    • http://bupuruko.cfpleasanthill.org/uploads/1/3/0/7/130776106/kemutilomixaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/43576481766.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/mugozenujefosubuga.pdf
    • https://cdn.shopify.com/s/files/1/0439/3893/9048/files/10th_class_maths_similar_triangles_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/gosisiroxometakexebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/somono.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/sijasal.pdf
    • https://cdn.shopify.com/s/files/1/0435/9687/3885/files/11712814939.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/noledobis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9829/files/musixusejunujefilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/toraladomokipina.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/kixopulufuwabuvugaden.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/divodunerodapu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f23.bin
ca26eab479c781a9367dda6d90c62e284936b9af0a215d032f90a3063cb2d725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F23 5680 bytes
font_01_sfnt_off00007284.bin
b08efebb4da987d1cfc5c41e3035122d706d264a3ac10a1a21d7bd9a74645c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7284 9916 bytes

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