Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8881dcc5812701e…

MALICIOUS

PDF

46.3 KB Created: 2020-08-24 23:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c51695f46390b663b6b35685d911151a SHA-1: d0369195c11787226a4c18ca2494288264e86f45 SHA-256: b8881dcc5812701e64d663a1db9ad68fe2684de5fd8293fcc2df0fba741f154c
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning technique used to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment that the embedded links are intended to lead the user to harmful 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=auto-+rotate+screen+settings+android
    • http://files.monicaposluszny.com/uploads/1/3/1/4/131438449/vadobutiborivis.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7626/files/10869578553.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/mesonalerometoxoxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9709/5333/files/tatinoporutilisemogore.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/setapolujelolis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/adverb_phrase_examples.pdf
    • https://cdn.shopify.com/s/files/1/0438/5194/0000/files/ay_ai_sound_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4977/files/rederixulesodamavaru.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/adobe_creator_editor.pdf
    • https://cdn.shopify.com/s/files/1/0440/5044/8549/files/13029390827.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/52531150552.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/lojopexevev.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_off000078bd.bin
b3a8443cbe691c5f06133804b4dbb4ee0d0db720675133a10f2177f210daf849
pdf-font-stream PDF embedded font (sfnt) at offset 0x78BD 5096 bytes
font_01_sfnt_off00008a20.bin
0af74c94c4018ce1d478c3e47b3d06890cc05b64e31c9daff183c12e5fe5068c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A20 10204 bytes