Malicious PDF — malware analysis report

Static analysis result for SHA-256 835e42e6d10b3417…

MALICIOUS

PDF

50.0 KB Created: 2020-08-10 16:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e09156131ccd0d0475245a767c31c485 SHA-1: 4c08d96507d2e403cdf9edcc6ac5ace0826d54e8 SHA-256: 835e42e6d10b3417288a0a51027fe5e4e0f3bd98065b32f610e6bbf7905ac58d
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though corrupted, contains text suggesting a PDF download lure. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or exploits.

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=b.+p.+lathi+pdf+download
    • http://files.westaucklandcadets.com/uploads/1/3/1/4/131454523/luramogosulun.pdf
    • http://files.threadstoinspire.com/uploads/1/3/1/0/131071082/seguxozowiso.pdf
    • http://files.createfairtrade.com/uploads/1/3/1/8/131858481/sujemele_sasiwodip.pdf
    • http://files.aa-gue.com/uploads/1/3/1/6/131607027/duzeligatamuxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/doki_doki_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/dakovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/rikigovizotutik.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/20418714117.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8286/files/12874180359.pdf
    • https://cdn.shopify.com/s/files/1/0440/3114/8197/files/wefasolovimakoradipadoru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/7253020769.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/anchor_hillsong_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1066/files/asymptotes_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/article_writing_format_cbse_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/48917207712.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/13456538433.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/vagonepujezexodopibowivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/kogolipaxumeredalejuxixis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000648a.bin
f2b9d75f0afbe6beb1f10b0496670140fe74b4b903258e53419b3f37be4f7f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648A 4696 bytes
font_01_sfnt_off00007481.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7481 2116 bytes
font_02_sfnt_off00007e4b.bin
41b0044f7fec70db58b46099d98373a8ae9532a3553d8cf29d51a32ba9e9ae2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4B 14984 bytes
font_03_sfnt_off0000ac89.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC89 4324 bytes

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