Malicious PDF — malware analysis report

Static analysis result for SHA-256 023ec3920984dbfe…

MALICIOUS

PDF

45.8 KB Created: 2020-07-30 18:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05dd2c155f4915aa7e48e150233672d SHA-1: 411a1c3cafd8c209d481cd0d12771f62582ac491 SHA-256: 023ec3920984dbfec8e11241a0a8b98600f336695620232163b961076f901a8e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to drive traffic to potentially malicious or SEO-manipulated sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

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.com/pify?keyword=simple+past+tense+exercises+pdf+ingilizcecin
    • http://files.videogirlpro.com/uploads/1/3/1/4/131406849/watewi.pdf
    • http://files.wellbee-ing.com/uploads/1/3/1/3/131380848/lelegujumode-kebogek-rarala.pdf
    • http://files.zlechien.ca/uploads/1/3/1/4/131437246/646518.pdf
    • http://files.k9kath.com/uploads/1/3/1/6/131606159/5322826.pdf
    • http://files.oddballcraftscreations.com/uploads/1/3/0/7/130775583/rovaz-lodesi-badazawavap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/gefediwosamovavegaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/naduz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4225/9612/files/rutuzajagebote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/teziwaguta.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/lotuzoloxavumejixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/26650435695.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5073/files/zojutela.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/fumovezapegerazadeputa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/3077776152.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/18871609136.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/kosajinejotefazu.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_off000074de.bin
0f3793e437c1bdff30b3551e80b684c099d9cdd7dc625559db2a374a850d78a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DE 5372 bytes
font_01_sfnt_off00008709.bin
f205734100a411ce687221d6096e4ce2b3f305df9c7a21abb2f137f07a01c6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8709 10288 bytes

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