Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1c73175e18eca7…

MALICIOUS

PDF

51.7 KB Created: 2020-08-03 04:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2834329bb723a8813103a8914f8cb6fd SHA-1: f2f4cec9c4405f24fd5188fd666ae8f20a316c6f SHA-256: 5e1c73175e18eca71dc69b6570060436ba197b1650750749af711ef0faa38427
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors or unknown domains, suggesting a link farm or phishing attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The document body, though partially corrupted, contains a URL that mirrors the one flagged by the heuristic, reinforcing the malicious intent.

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.ru/pify?keyword=black+and+decker+20v+weed+eater
    • http://files.darylglinntanner.com/uploads/1/3/1/8/131856326/gokijimudipalu-wunen-rebepexukijoge.pdf
    • http://files.yucatancustomfurniture.com/uploads/1/3/0/7/130739094/linepetevu_jowirufu.pdf
    • http://wifolasup.tailoredmuse.com/uploads/1/3/0/9/130969352/wubek.pdf
    • http://files.makeamarkfoundation.org/uploads/1/3/1/8/131856950/gosati-besosagijanutos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/30189229304.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/10060026676.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/zutibizivalibugadov.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/vaxativij.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/52724032600.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/xulixonaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/56190017913.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/75252055575.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/47341230210.pdf
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/4400775886.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/54958781456.pdf
    • https://cdn.shopify.com/s/files/1/0441/2227/5992/files/2k16_badge_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1999/files/powaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5026/files/18971599419.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007025.bin
8ff94f3b21c80d39573816c1502a66a1a3a222f46e2aa4fe1717dfd0f3ee4b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7025 4924 bytes
font_01_sfnt_off000080fb.bin
e32eb083870fec14f7fcb60ab2f74b9dff2bd8dfdb35cb8ab62f02c48982c5ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FB 15432 bytes
font_02_sfnt_off0000b1cc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CC 4324 bytes

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