Malicious PDF — malware analysis report

Static analysis result for SHA-256 880704deb7f05e6b…

MALICIOUS

PDF

47.9 KB Created: 2020-08-10 06:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3261d4d9e8a9c5215e202df38a72a39e SHA-1: 34bbfa5961ee90cedc752c3cb6d84f075cc57bca SHA-256: 880704deb7f05e6beca4c7bd3336b899c9c0505027a21a7c5304d9edf8d0cc56
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to look like a dictionary download. The document body, though heavily corrupted, contains embedded URLs that are part of a link farm, suggesting an attempt to drive traffic to various sites. The ML classifier also strongly indicated maliciousness.

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=dictionnaire+larousse+anglais+fran%25C3%25A7ais+pdf
    • http://files.mrsavans.com/uploads/1/3/0/7/130775001/3599858.pdf
    • http://files.markromangbooks.com/uploads/1/3/0/7/130776484/telilapamavupuviw.pdf
    • http://luxunaz.novawestsupplies.com/uploads/1/3/1/6/131606490/e7620a675e5c3f.pdf
    • http://files.whelkboy.co.uk/uploads/1/3/1/4/131437655/jepom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/lupekerowowedidugalokov.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/nuwumuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/megupebivatewaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/lerepiferidunogove.pdf
    • https://cdn.shopify.com/s/files/1/0446/9565/0457/files/96728166313.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/mtg_arena_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0438/2552/8989/files/58042404598.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/xonaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8854/files/71718963253.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/26210083506.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/3707191655.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/succubus_race_5e.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_off0000763e.bin
47f66bc6e0646d4c99cffda9962112d493da9e57a9580c6b6c20ea941a937db8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763E 5504 bytes
font_01_sfnt_off000088c8.bin
508d10ab40570e6bf1c286d94a4c6ea36363be53580a216affc035b7378e4e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C8 12368 bytes

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