Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9ef01bc82f187d…

MALICIOUS

PDF

44.4 KB Created: 2020-08-06 10:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7844ac0106b209d91046ba988c21ab SHA-1: 37dab884633422f3353454209aed7eb7928f7328 SHA-256: ca9ef01bc82f187df78009d6c5baffca9e67ced079fc876fd9a76865b315caac
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about drone motors. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the ttraff.ru URL, which likely leads to further malicious content or exploits. The document also hosts a large number of other PDFs, suggesting a link farm or SEO poisoning tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=brushless+dc+motor+for+drone+pdf
    • http://files.yosukehashidate.com/uploads/1/3/1/4/131453215/gofevu.pdf
    • http://files.americanseptember.com/uploads/1/3/1/3/131380845/c3dfa5521.pdf
    • http://dipozoj.nanasnotwhatsandlagniappe.com/uploads/1/3/1/3/131379833/157084.pdf
    • https://cdn.shopify.com/s/files/1/0430/3706/5370/files/nelirukebirikukafaviviga.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5809/files/acetilcisteina_20mg_ml_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/missionaries_and_cannibals_problem.pdf
    • https://cdn.shopify.com/s/files/1/0438/0327/9517/files/lojumuzilariginagafan.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/california_bar_registration.pdf
    • https://cdn.shopify.com/s/files/1/0449/7879/8750/files/absolute_value_inequalities_practice.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/59820215828.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/pivabafunaliretudapon.pdf
    • https://cdn.shopify.com/s/files/1/0449/6778/8712/files/since_you_ve_been_gone_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/analgesik_adalah.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_off000070b6.bin
2b4d71f6701fb004b7683173ca651d96847de8cf1d638fe9b974574d24d6834a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B6 5232 bytes
font_01_sfnt_off0000825e.bin
0a2ea91dcca2a6b3d7f9c8534224396aa94ea82c325d6cf2691ac436dc00b658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825E 10132 bytes

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