Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef1578b3f773491…

MALICIOUS

PDF

43.0 KB Created: 2020-08-01 15:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce24423fa322e059b85e98a07c901150 SHA-1: a698d04afe723e3854a1a4b2bebcb416677712bc SHA-256: 1ef1578b3f77349114b08703c6be7680d88ec007ac2abec31f4f1d7bd664adea
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a significant number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO spam campaign. One critical heuristic identified a link to a known malicious redirector at https://ttraff.ru/pify?keyword=st750lm022+hn-+m750mbb, indicating a probable phishing or malware distribution attempt.

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=st750lm022+hn-+m750mbb
    • http://files.rosewriting.com/uploads/1/3/1/4/131406558/1892392.pdf
    • http://files.ruralnevadanews.com/uploads/1/3/2/7/132710780/d787f98c.pdf
    • http://files.chainofeventsbw.com/uploads/1/3/1/8/131857115/wotokafepoxukusap.pdf
    • http://files.theyogaden.net/uploads/1/3/0/7/130775400/gogan_nivofipav_jenuraxik.pdf
    • http://files.mygosolartoday.com/uploads/1/3/0/7/130739316/ganosixagufunem-fafot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1458/files/gavolisepekigon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/gatediraxofusolenopuxev.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/poporawivatuja.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/favuzigenabagopoxuxavuve.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/gumikopefugawegu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/1837634746.pdf
    • https://cdn.shopify.com/s/files/1/0434/3575/3639/files/91492490971.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/46501015598.pdf
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/kutojobox.pdf
    • https://cdn.shopify.com/s/files/1/0439/1324/8923/files/340065268.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98012128422.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/97863427058.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_off000066e4.bin
9a4795e5a19da6b2ef1afbc107899cfe6deb131039dc8ed4e70e74784545f096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E4 5192 bytes
font_01_sfnt_off00007883.bin
6e41333cb512d0d81e7ba3a850356782f0ffea6ea7a0fa2d848df25c43c9be31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7883 11568 bytes

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