Malicious PDF — malware analysis report

Static analysis result for SHA-256 78551b4dbd3aaa72…

MALICIOUS

PDF

36.4 KB Created: 2020-08-14 05:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9227048d845d867cde1851aa7dfe0ab1 SHA-1: 07cda52c2a9d1bca110f09baecf11d1e8ceb31c9 SHA-256: 78551b4dbd3aaa7267e830aa62e35858357b406745af735a2a0748a253baf2c8
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.com/pify?keyword=ap+calculus+integration+worksheet+with+answers`. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect users to malicious infrastructure. No scripts were extracted from this sample.

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.com/pify?keyword=ap+calculus+integration+worksheet+with+answers
    • http://files.movingclay.com/uploads/1/3/1/6/131636946/pilus-lesezim-jinibekesomomav.pdf
    • http://saxare.textboost.net/uploads/1/3/2/7/132740278/88598e21.pdf
    • http://files.meplusthreephotography.com/uploads/1/3/0/8/130874633/3582178.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2184/files/beautiful_in_white_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/5517/6097/files/dieta_atkins_livro.pdf
    • https://cdn.shopify.com/s/files/1/0439/2534/0328/files/mularusesof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4274895189.pdf
    • https://cdn.shopify.com/s/files/1/0431/0859/7927/files/40752266194.pdf
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/zerulonorimumol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2346/files/rarolib.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/95704007145.pdf
    • https://cdn.shopify.com/s/files/1/0433/3977/6159/files/50759857534.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041ff.bin
745e22e175cb226a33d688e445b44714472db0f165cedd4d74832020c2991334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41FF 5220 bytes
font_01_sfnt_off000053c4.bin
0beecd6e2d4ee488205b085399dc53cb8f06dc967c544d3dd3c4248a79a298db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C4 10180 bytes
font_02_sfnt_off00007676.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7676 4324 bytes

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