Malicious PDF — malware analysis report

Static analysis result for SHA-256 791d0eba3d80b5b5…

MALICIOUS

PDF

51.7 KB Created: 2020-08-21 01:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebeee307170850ce884f4f09d369fb69 SHA-1: 18913fb46e2432b6d2c1f21c9175e1eb0c4e5b1e SHA-256: 791d0eba3d80b5b54ab8b10e67b5bf02bd491896fb965d08a59761ead60c811f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of many external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/pify?keyword=english+meaning+in+marathi+dictionary
    • http://guduxawis.villagepedaler.com/uploads/1/3/2/8/132814337/tulizub_bezozugovoxev_finuzekepemi.pdf
    • http://files.raynorselectricalservices.co.uk/uploads/1/3/1/4/131407292/cc5dc50e599b46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/prescott_microbiology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0741/files/81026781640.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/3ds_cia_apps.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/jujubezigodulurara.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6348/files/logo_maker_free_no_watermark.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/pidejafisevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/nebifanadinejomanito.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/97773214088.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/25826941906.pdf
    • https://cdn.shopify.com/s/files/1/0453/9963/8184/files/pics_of_amphibians.pdf
    • https://cdn.shopify.com/s/files/1/0434/0927/7095/files/50569829703.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/30451627883.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_off00006b39.bin
ad123cd41d1ebf71d6c617b468b05a024a2232e8dc226ea5dab863f22467e057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 5412 bytes
font_01_sfnt_off00007d70.bin
b2810f1f83ac5a32bfe9ad75bb0f982b670820341861f830160ba0a24efc8194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D70 16572 bytes
font_02_sfnt_off0000aecd.bin
0f615762519191db35a2b72583f402a1271bcd1498c0c420cd9b4fa3a86229ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECD 5100 bytes

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