Malicious PDF — malware analysis report

Static analysis result for SHA-256 84eca0afbd2a5107…

MALICIOUS

PDF

46.0 KB Created: 2020-07-30 15:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c00a77b40bdb2b42726e74446df6d88 SHA-1: 6274fc2714c80b583f5c3fbb922157f6d0666920 SHA-256: 84eca0afbd2a51070ecbc7c74d1e4174d19fe8cee68d16fa5eca712915bcd18a
154 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 pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning or traffic redirection. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains text related to downloading a PDF converter, aligning with the observed link farm behavior.

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=download+able2extract+pdf+converter
    • http://files.destinwestvacation.com/uploads/1/3/0/7/130738841/fuzopi_refapofuxa.pdf
    • http://files.sgsquishies.com/uploads/1/3/1/4/131455283/kefedeworimo-laxevot-merovaxumud.pdf
    • http://files.moombaparkps.vic.edu.au/uploads/1/3/0/7/130738792/5c3d80c06ac.pdf
    • http://files.destinwestvac
    • https://cdn.shopify.com/s/files/1/0433/5930/5877/files/digavozowoxoranuladi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/rubelipilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/buterekolesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/16549906307.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1877/files/tolofoxovun.pdf
    • https://cdn.shopify.com/s/files/1/0432/4727/2098/files/16298849623.pdf
    • https://cdn.shopify.com/s/files/1/0436/1207/8243/files/fukuwolefubeguko.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/8422568179.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/pugagodegopikuzadajiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0099/5741/files/87521256862.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/tetururorepurazazila.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_off000075bb.bin
d0d9ac84d44c96daa8b22e256f0e058c5a715affa2a7f1e58ced737001015de0
pdf-font-stream PDF embedded font (sfnt) at offset 0x75BB 5200 bytes
font_01_sfnt_off00008795.bin
720adc636a12e9bffccd17311443edcf204fa72154becf5c815c151d48b3c17e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 10116 bytes