Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a1919872415a15…

MALICIOUS

PDF

41.7 KB Created: 2020-08-03 23:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f94e7d816f3c419961e92a5b4316f59e SHA-1: e738c43c03dddcf4a1f985c4f99c61e47770977e SHA-256: d0a1919872415a15be54888a899d7080a50cff32a8ab1fd5f7da603c3804391a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting the primary purpose is to lure users to malicious sites.

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=armor+of+god+prayer+pdf
    • http://files.abilitycenterva.org/uploads/1/3/1/0/131070146/825b17a89c.pdf
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdf
    • http://files.centraleuropeanstringquartet.com/uploads/1/3/0/8/130814492/labumu_vokovexevaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87913440599.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/13826774578.pdf
    • https://cdn.shopify.com/s/files/1/0429/7277/4556/files/sosanuzowivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/81854890810.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/31545968832.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/synonym_for_deeper.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/rovor.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/22361637355.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/sigixawafebopomop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/naxud.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/waropusekumokarazexe.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_off0000669f.bin
7885770e7fffa99682a4589d57574edab8af3b3027595ec09beaffc4ef85e95d
pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 5244 bytes
font_01_sfnt_off0000786c.bin
3851b95ce1c476d5295c677e098dcc3236bacc192bb2edffcb9fa0c3381033bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 9936 bytes