Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5ad670f5174a13…

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 04:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7138773021f419c79555c607d9817625 SHA-1: 2311c2d209ab3203084b8fd73ba964729df80410 SHA-256: fa5ad670f5174a13a6fb9720f1f6eb2f9e6a0a49ccec7f23f41b0cc446bca5ce
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'aptitude test with answers pdf' and the malicious URL itself, suggesting a lure to trick users into clicking the link. The redirector URL is the highest priority IOC.

Heuristics 3

  • 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.
  • 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/pify?keyword=aptitude+test+with+answers+pdf
    • http://files.thomastrevethan.com/uploads/1/3/1/3/131398555/7750438.pdf
    • http://files.soul-blossoming-therapies.com/uploads/1/3/1/3/131380258/lusux.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6253/files/wudokuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1752/files/73954106541.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64830269039.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/zoxixabejewatan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/4435599795.pdf
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/gaxorefunirakukisijipevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/lumatuxanerotikaxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/77494356969.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/mamesoxatabuminineruduke.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/zelaxusafomijoloxugesa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/42341707368.pdf
    • https://cdn.shopify.com/s/files/1/0434/1153/8072/files/aviculture_moderne_au_burkina_faso.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_off00005f3b.bin
d90f71906de218255323b3389bdae5a7f5dab7c44898896dce7919ef2a6f95ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 5180 bytes
font_01_sfnt_off000070dd.bin
028b8f4307e4ceb089a4e9297bf354af662db17b718352afecdf23dc5976444d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 10588 bytes

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