Malicious PDF — malware analysis report

Static analysis result for SHA-256 56044ba651485e44…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 20:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f5b1c70a35f055f01d5d9e7e89e9690 SHA-1: 31330df839408aefe0895b83a998037fb5f00ad1 SHA-256: 56044ba651485e4454b720912951270b1a412855201140852a2c2c7313ec96d5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search results or distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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=smoke+detector+notifier+882+pdf
    • http://files.marcvandewardt.com/uploads/1/3/1/3/131379732/64cd23b0f.pdf
    • http://files.rinatschnadower.com/uploads/1/3/1/8/131871705/doweb.pdf
    • http://files.connect2compass.com/uploads/1/3/1/4/131438718/9425754.pdf
    • http://files.thecompasslineak.com/uploads/1/3/0/8/130813696/adef186.pdf
    • http://tamamenus.theparentcompass.com/uploads/1/3/0/8/130814423/7658786.pdf
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/peposuwukos.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/zaxezenigoti.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/4946403833.pdf
    • https://cdn.shopify.com/s/files/1/0437/8610/9086/files/test_your_business_vocabulary_in_use_advanced_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/archie_vs_predator.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/xigonufivubojenukup.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4452/files/96592000340.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/kikofesibavasezegif.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/86471818832.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vidabuvuwegorowomilamum.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/nexus_5x_boot_loop_fix.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645e.bin
f39d237797fa652ce9fde4ba65bb2dfdbd0172c00bd9ca05b0b110ccbf6c3b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 5372 bytes
font_01_sfnt_off000076a0.bin
3961553171c3b49ffce8069cef77b31db8393d14f28a93218caf6b1cbda87ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 10532 bytes