Malicious PDF — malware analysis report

Static analysis result for SHA-256 55da54e045675f5e…

MALICIOUS

PDF

46.2 KB Created: 2020-08-11 04:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d909e824205c17e26bc8a75732002c3c SHA-1: ab0ad54d075394cd1620726f3545fe0904fad196 SHA-256: 55da54e045675f5ec1f5b1fd4f2c02aff0535bb94be7839a1106b934c3f774a0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=cuales+son+los+derechos+de+los+ni%25C3%25B1os+en+colombia+pdf`. The document body, though heavily corrupted, contains fragments of this URL and suggests a lure related to children's rights in Colombia. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted from this sample.

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=cuales+son+los+derechos+de+los+ni%25C3%25B1os+en+colombia+pdf
    • http://files.dualcredit23.com/uploads/1/3/1/4/131483361/xavezitizawu_kujadewonutov.pdf
    • http://pozak.edgeofhell.com/uploads/1/3/1/4/131438137/8024136.pdf
    • http://files.michellevanlare.com/uploads/1/3/0/9/130969603/jitisunagejekavob.pdf
    • http://files.sri.vn/uploads/1/3/1/8/131856050/6186648.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/10166571485.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/blueprint_homeschooling.pdf
    • https://cdn.shopify.com/s/files/1/0434/3532/7653/files/corpse_bride_victor_s_piano_solo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/foxit_editor_full.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/95327745256.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/65241974205.pdf
    • https://cdn.shopify.com/s/files/1/0439/4775/3640/files/55021225652.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5881/files/manual_and_automation_testing_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/0832/6812/files/pepozogosaxunimana.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/pasadena_weather_10_day.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.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_off00007153.bin
6252de0fb26f44c43027020595d1323092b1e8ecb1db34bf587259e9ef52b87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 5652 bytes
font_01_sfnt_off0000840e.bin
e3deed1fa66154cf10466cba62ed83a849d9053aad436350b8f7a9c22f472933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840E 11240 bytes

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