Malicious PDF — malware analysis report

Static analysis result for SHA-256 8422ee0660d35507…

MALICIOUS

PDF

41.0 KB Created: 2020-08-25 04:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a74f9657e94e10132cdb2c31a9cf9964 SHA-1: e6c5fc3d46470784d773bac8066f9f0a101c8df0 SHA-256: 8422ee0660d355074c9315583b4ab2059cc0acb01fe8241f2cfb8309e11c702d
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The presence of the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics strongly supports this attack pattern. The ML classifier also flagged this PDF with high confidence.

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=voltage+divider+example+problems+pdf
    • http://files.akesia.org/uploads/1/3/1/3/131379111/zazejumuje_jomaposuzixos_lugoxomi.pdf
    • http://files.darkpeninsulapress.com/uploads/1/3/0/7/130775750/49b44.pdf
    • http://files.howlingflatsfarm.com/uploads/1/3/0/7/130776338/9802318.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/bafazikefogalipanidina.pdf
    • https://cdn.shopify.com/s/files/1/0430/7864/7957/files/malayalam_bible_quiz_genesis.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/xaxukobowapadaniju.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/27819112774.pdf
    • https://cdn.shopify.com/s/files/1/0434/1694/4807/files/37232470776.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/61062583224.pdf
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/arinc_429_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/budgeting_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/67241168265.pdf
    • https://cdn.shopify.com/s/files/1/0437/4836/0343/files/inorganic_chemistry_book_for_bs.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_off0000619a.bin
d48b6db3b84b891373f463f35050852fd756e7f34107112f8e373a8749512d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619A 5596 bytes
font_01_sfnt_off00007488.bin
f7fdb677f7632c843ad34f5f85056d5a64dd910d3db61265bb5f0fdad3997aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7488 10112 bytes

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