Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c70752bf443f6…

MALICIOUS

PDF

47.5 KB Created: 2020-08-10 15:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228f5888a2852e21c205c5082a1e1a10 SHA-1: ebfe44ed7f48f96ca1e971142b1c15c5fdc40e62 SHA-256: 868c70752bf443f622869b4940ee21ffddf43b09ba74defae529879cb84771c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=pae+esquizofrenia+paranoide+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be SEO manipulation or redirecting users to potentially harmful 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.ru/pify?keyword=pae+esquizofrenia+paranoide+pdf
    • http://nifekar.afterorthorevenue.com/uploads/1/3/1/4/131438641/189d3f.pdf
    • http://files.spiritadfundraising.com/uploads/1/3/0/7/130740053/tumalale.pdf
    • http://files.nationalwealthcenterclub.com/uploads/1/3/1/3/131383760/fanibigakupaxo_zetasunev.pdf
    • http://files.silvercreekcomn.com/uploads/1/3/1/3/131383727/gapitibure-dajasedu-tokosejod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9945/3608/files/20055418305.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/79541008169.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/ralezumewisofibaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/foruwud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/python_restart_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/5016/3609/files/drake_legend_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0449/7106/5503/files/immune_mediated_hemolytic_anemia_in_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/85156813294.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/72476248639.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/luwivotamixabuwuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/zotutiwufajixowaxexado.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/90862592862.pdf
    • https://cdn.shopify.com/s/files/1/0437/7971/9330/files/coarse_aggregate_in_concrete.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_off00007b56.bin
d2a2b4428a656a5bdb057a4b6ec6a36184cd1db2311395c16dd6643083880cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B56 5180 bytes
font_01_sfnt_off00008d05.bin
561937d7ea7c1594e90a7eaed256d0f95eb3a3338850807e9f9bae3f16c21586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D05 10492 bytes

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