Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d280d8ad02d8b8…

MALICIOUS

PDF

40.2 KB Created: 2020-07-18 23:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9716cd8febe807957ea5226eee9fe70 SHA-1: fc714ebd95513c35e499f5e259ce593b5fd02963 SHA-256: 57d280d8ad02d8b8628e69bbf71fd7a438a5d7aa5c9b9a42aa30844d60e4d05d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/pify?keyword=elna+624+overlocker+manual', points to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, but the presence of the link farm and the malicious redirector strongly suggest a malicious intent, likely for traffic redirection or to serve further malicious 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.cc/pify?keyword=elna+624+overlocker+manual
    • http://files.featuredlistingswnc.com/uploads/1/3/0/7/130775950/sometopuda-mobuzimumunola.pdf
    • http://files.artventures.org.uk/uploads/1/3/1/3/131380767/sariroja.pdf
    • http://files.framemysore.org/uploads/1/3/1/3/131384789/7349004.pdf
    • http://files.rhythmsofgracecommunityfellowship.com/uploads/1/3/2/3/132302992/2695323.pdf
    • http://files.deepgrassgraziers.com/uploads/1/3/2/6/132682819/gajofigibixetoxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/nefikadisoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/7658813943.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/fobolim.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/31954952235.pdf
    • https://punetenode.files.wordpress.com/2020/07/18609691560.pdf
    • https://bafuximafeza467793456.files.wordpress.com/2020/07/78955352075.pdf
    • https://lusotadefel.files.wordpress.com/2020/06/43962295599.pdf
    • https://gakijisib.files.wordpress.com/2020/07/89525807280.pdf
    • https://zutatakinud.files.wordpress.com/2020/07/64028039735.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/69172808185.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/fuliparevuzegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/83328305143.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/3994/files/xovekixixof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32505595602.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/wabunabarukufoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/26949580777.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/12728160799.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/resepetakixekubovavil.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_off00005f81.bin
44536034bff245bbee399685a3b2f6e0ad419c37d34d765b66254f6adc09c23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F81 4976 bytes
font_01_sfnt_off0000705c.bin
f9e6b433c8f641043ec76cfee948005ff332f4ed7bdc4f47d155904ff20c748a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705C 10320 bytes

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