Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ec9757bc94cb74…

MALICIOUS

PDF

39.3 KB Created: 2020-08-23 18:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dacc6175ddfd48544365c1612bcda66 SHA-1: 1a143ced51fa4769cdb7f98b4cefe1848d3c3ee3 SHA-256: 00ec9757bc94cb749bcbf2846b00b7a13baa3df3bc3f696bbefb2a371a4ed7bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous links to external websites, including a known malicious redirector at ttraff.com. The document body, though partially obfuscated, contains text related to 'expanding and simplifying polynomial expressions worksheet' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of multiple links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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=expanding+and+simplifying+polynomial+expressions+worksheet
    • http://files.chelseagouldnp.com/uploads/1/3/0/7/130739780/bupivofubekide.pdf
    • http://files.nottingham-north.org.uk/uploads/1/3/0/9/130968933/kupunuvulemekid-sepujuzox.pdf
    • http://files.greenandhealthyschoolsacademy.org/uploads/1/3/2/6/132695714/2202760.pdf
    • http://files.bltsnv.org/uploads/1/3/1/1/131164520/pudujoxe.pdf
    • http://files.sunsetridgeatlanesend.ca/uploads/1/3/1/4/131453355/6121706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/roxiro.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/bolijijujitu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/pupezidudes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/22907218716.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/kabexefukuremukagore.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/69899812118.pdf
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/2298336897.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/nuzixowaveparufenisute.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/72938099462.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/john_deere_445_service_manual.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_off00004c2e.bin
9f62a84791983240319017a0bd0e4188b2baef37f5d1891a27582c6c6c735c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2E 5528 bytes
font_01_sfnt_off00005ee6.bin
02ff700538319ee14f1e434ea2e577374750308de1eff190f8ed64f951632f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE6 10160 bytes
font_02_sfnt_off000081ab.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 4324 bytes

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