Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f11088efca2d09a…

MALICIOUS

PDF

70.8 KB Created: 2020-08-30 23:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be605ad31e93f4aeb062d91ec35e0617 SHA-1: 60c509a2023dc368a938c524e3dddd77fec9aa73 SHA-256: 0f11088efca2d09a104a9c47ccc77678760c09afec01418a91b4eb0b1c54444d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector URL. This indicates a link farm or SEO poisoning attack designed to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to distribute 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.ru/wix?keyword=internet+and+world+wide+web+how+to+p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/1864101081.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9585/files/52667541143.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/zaxuxegunetunufutopoxava.pdf
    • https://cdn.shopify.com/s/files/1/0461/7542/0579/files/2._binomische_formel_lsen.pdf
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/vomurusem.pdf
    • https://static.usrfiles.com/ugd/f46427_a75a97377b41477a85dacf4d802bfa2a.pdf
    • https://static.usrfiles.com/ugd/f63f29_1d40b3ba2c9e4d48931413afac029117.pdf
    • https://static.usrfiles.com/ugd/b8c837_01138b9847b64762b35bb299ae6ebf02.pdf
    • https://static.usrfiles.com/ugd/ae15ca_4029e7b6be68475aa2e834a7768602cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_64ff54eb1c6c43e0a006ccc99c6f5e33.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea0001b221fd4fb5b415616e2a688e68.pdf
    • https://static.usrfiles.com/ugd/b8c837_6422be812c0c43898afed07fbb5b8c8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_31acf244f30c48d9ba84016a7ceea100.pdf
    • https://static.usrfiles.com/ugd/704566_3cefb826d91f4a73a753a716fe988d44.pdf
    • https://static.usrfiles.com/ugd/de3d83_683ccbd79846429d9bf8689520b97cbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_da30d6ebb71e486ba35eac40279845ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_548c94c05dee4178b9bbfeab9398e19c.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce0.bin
1e471e7be47dc98a7a7d4609111e5f40eec9b1ed5ea696716d7468ad3132612b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE0 3724 bytes
font_01_sfnt_off0000ca05.bin
57486fd604fd62bb02dc955d486a6d79bb7f6e54d0256b8bc065aa2dd7573f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 4828 bytes
font_02_sfnt_off0000da5b.bin
f5df5d3335890c05110eef391cd13cee3c09bbfdb9d031e2e03e796dc409caf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 10996 bytes
font_03_sfnt_off0000ff29.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 4324 bytes

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