Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd31e69fc850372…

MALICIOUS

PDF

48.9 KB Created: 2020-08-31 16:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 882d2e14f71f240a228c7f6247cc592c SHA-1: 803e052b05fc30a774c36b7391b55359f770c907 SHA-256: 6cd31e69fc850372bb986b7d773751c6a10325a2512a2e45244395a064c1d30f
194 Risk Score

Malware Insights

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

This PDF file contains a heuristic indicating it's a malicious redirector and a link farm, aiming to direct users to potentially harmful websites. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding. The presence of numerous Shopify links, some marked as benign and others unknown, suggests an attempt to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/wix?keyword=barrel+racing+report+archives
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/definicion_de_bacterias_gram_positivas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/varewujisud.pdf
    • https://cdn.shopify.com/s/files/1/0436/2259/6768/files/1861342060.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40035930655.pdf
    • https://cdn.shopify.com/s/files/1/0440/2148/1622/files/91940833864.pdf
    • https://cdn.shopify.com/s/files/1/0447/7675/1261/files/brain_anatomy_images.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/nenizunevetoxe.pdf
    • https://cdn.shopify.com/s/files/1/0441/2017/8840/files/91379012546.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/55383169326.pdf
    • https://static.usrfiles.com/ugd/73cb9e_723ca5af0c1c42c280ceaff91c6afc6c.pdf
    • https://static.usrfiles.com/ugd/ed64d2_e3f3ef36597c455e80b68822729561bb.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_off000060db.bin
8f11bdd2b81bb2fe42250cb98b6ca86dff5d25faf0d0fb2aa05e147474f8f54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DB 5092 bytes
font_01_sfnt_off00007217.bin
ca4ef642880721786e69cf081c9d3bff1ac314fdd5922e9fed3124e9945a67a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 4720 bytes
font_02_sfnt_off000082ba.bin
740fb77c81f0cf8dba18a33576f4aa91ba7a848aff2099f67477af19fb7c7fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BA 11084 bytes
font_03_sfnt_off0000a860.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA860 4324 bytes

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