Malicious PDF — malware analysis report

Static analysis result for SHA-256 1111fc3d7d73d3f5…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 08:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b96b483194cbdfe222443e75af2c71cc SHA-1: 825ff957375293adba1d27ca457529e2c0b61c59 SHA-256: 1111fc3d7d73d3f5dcdeefcf6652c2f3104e9f5fb20d8be4814a88631c69ffb3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=br%25C3%25BCche+multiplizieren+%25C3%25BCbungen+pdf'. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse for malicious purposes.

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=br%25C3%25BCche+multiplizieren+%25C3%25BCbungen+pdf
    • http://files.jlwarfieldministries.com/uploads/1/3/1/8/131871786/nuriratis.pdf
    • http://files.dermmedclinic.com/uploads/1/3/1/4/131437044/d092e6f31.pdf
    • http://files.westtechmobile.ca/uploads/1/3/2/7/132741385/fipef_lelutifuxen_suxadipa_bovafiw.pdf
    • http://files.sproutlanguagesolutions.com/uploads/1/3/0/7/130739802/wolofizowudegot.pdf
    • http://jufev.mindraym5.radiologyequipmentstore.com/uploads/1/3/1/0/131070722/muxokizuzutagila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6979/2668/files/11458750079.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/75194593439.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/detowavuvugizosiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/4316047961.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/bemawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/94975334617.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/85497386661.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/62676514381.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/fefexizanibufujen.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
stream_004_off00006fbb.bin
ed1083692400ac376c6004e592d1926bb854ceb434ae638e572b784cd0a79056		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6FBB 11092 bytes
font_00_sfnt_off00005d36.bin
f23ee19169e4dd34d92740153665e0869a09dbed4911e165c0e0814428aaf0b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D36 5540 bytes

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