Malicious PDF — malware analysis report

Static analysis result for SHA-256 2865770ac090d1eb…

MALICIOUS

PDF

43.0 KB Created: 2020-08-26 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48c5a74c468dd5bc17dcc6dc650b1ae8 SHA-1: 44e83c86c2bc2a93d6f76e270214c0a5edf84102 SHA-256: 2865770ac090d1ebf4a832fc31caed5e1e2292a051516171acc98977d78d206d
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as an answer key, but the primary link redirects to malicious infrastructure. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirect. The presence of numerous external links, many hosted on Shopify, suggests a tactic to manipulate search engine results or distribute malicious content through seemingly benign documents.

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=nutrition+label+worksheet+answer+key
    • http://files.centralorartawards.com/uploads/1/3/2/8/132814624/loxiwejox_bidegelako_fatasemigomi.pdf
    • http://gobuwis.napashuttlelimo.com/uploads/1/3/1/3/131384260/85ebc737.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/14707864765.pdf
    • https://cdn.shopify.com/s/files/1/0428/7037/4566/files/72094416901.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/pixolakijewitolegugegob.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/past_simple_tense_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/35281655174.pdf
    • https://cdn.shopify.com/s/files/1/0437/8286/5047/files/62844763523.pdf
    • https://cdn.shopify.com/s/files/1/0430/1360/3491/files/xekegexux.pdf
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/situdexuxavomadoxolurerir.pdf
    • https://cdn.shopify.com/s/files/1/0463/5390/7869/files/roman_catholic_breviary.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/leave_adjustment_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/14429062506.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_off00006a23.bin
d9665b989cfb75ab8c05966f5a2e5cb0e6e1ce95074679f731ea0650e3884128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A23 5140 bytes
font_01_sfnt_off00007bab.bin
0d5ed73b2b552470814c0d49614ed698c1a78c97938a3b4a3494a5b6e1837ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAB 10352 bytes

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