Malicious PDF — malware analysis report

Static analysis result for SHA-256 0138bb688de13cab…

MALICIOUS

PDF

50.4 KB Created: 2020-08-08 05:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8400d675bf24211c903da78f38592480 SHA-1: 9d7b1152ba32f2d9bd870086839adca6f4db5cd0 SHA-256: 0138bb688de13cab32d71188c0a45e966c07e1772d98d049bd3e6cc5fa96b9d4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=critical+thinking+skills+worksheet+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users into clicking malicious links under the guise of a worksheet. 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=critical+thinking+skills+worksheet+pdf
    • http://files.bluemoonbeautyandskin.com/uploads/1/3/2/6/132681080/basosebixilamakovazo.pdf
    • http://files.cooperphysics.com/uploads/1/3/0/7/130775712/tujulapofawil-vurisidozegu-fuwuwedir.pdf
    • http://files.tiffanyshocklee.com/uploads/1/3/1/4/131438682/labaza.pdf
    • http://files.phonerepaircolorado.com/uploads/1/3/0/7/130775888/kokebewebomi.pdf
    • http://files.mariettaoddfellows.org/uploads/1/3/1/6/131606395/86772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2390/9532/files/4463528125.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/315_437_8800.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/84713520616.pdf
    • https://cdn.shopify.com/s/files/1/0440/3704/6437/files/zakewazuxubenur.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/gezesifogoxuxoremezim.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/31786201181.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/21404374401.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0259/files/ready_player_one_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2734/8121/files/2005_chevy_aveo_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/57167203252.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/yanmar_diesel_engine_parts_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/faa_337_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/luvisokogezapawenojax.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000859a.bin
bff594d7ae41e66beb0d9af0ace2a7d960e39c51785171e2378fb05b9f8ec89a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x859A 5476 bytes
font_01_sfnt_off00009844.bin
08712d15dc3ac1251806854ec1cc0526d9c016b7e12ce53ff3f3b6f17b6fb677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9844 10676 bytes

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