Malicious PDF — malware analysis report

Static analysis result for SHA-256 471c83d2875617d7…

MALICIOUS

PDF

47.6 KB Created: 2020-08-08 12:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0226fb9f6b553d89a488df8d0727fc SHA-1: 63b64c2af86cb699c62cba078a32254cc15a347a SHA-256: 471c83d2875617d7d1eac8fff30f08630eb7a43fc8a414899d07e24872da4dc1
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=apology+letter+template+for+elementary+students+pdf, which is a primary indicator of malicious intent. The presence of numerous other links, many pointing to Shopify domains with numeric slugs, suggests a link farm used for SEO poisoning or distributing further malicious content.

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.cc/pify?keyword=apology+letter+template+for+elementary+students+pdf
    • http://files.michaeltsarion.com/uploads/1/3/1/4/131455463/wifukuxo.pdf
    • http://files.warlockwardrobe.com/uploads/1/3/0/7/130775108/rubasiwuvesuzo.pdf
    • http://files.makatontrainer.com/uploads/1/3/0/7/130775249/3639445.pdf
    • http://files.utartstudentgallery.org/uploads/1/3/0/8/130815115/1258362.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7454/files/31948038080.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/ni_no_kuni_familiar_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/subiwesuditavetufanov.pdf
    • https://cdn.shopify.com/s/files/1/0438/2746/2301/files/usarc_form_62_r.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokesinoximirupabujikupoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/21473661282.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/7558131782.pdf
    • https://cdn.shopify.com/s/files/1/0433/7913/0524/files/newivifasijufowudog.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/begrijpend_lezen_oefenen_groep_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/nukugekawisezunafifetopox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/82946546266.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_off00006f1d.bin
115dc12de77881c9c659386c60bc1fd6d1b6f543f1352a27095703a4c2cb5398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1D 5288 bytes
font_01_sfnt_off00008106.bin
d2ca8b7e2da66fa06126340706a864f3bcdc5eaeef677dd9d02486701a913baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8106 9980 bytes
font_02_sfnt_off0000a334.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA334 4324 bytes

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