Malicious PDF — malware analysis report

Static analysis result for SHA-256 185eac6c87698886…

MALICIOUS

PDF

37.0 KB Created: 2020-08-14 03:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fd2a87936a0720beac657f847875602 SHA-1: 9b9c3a886bd867975618be36959dc39366f99e1c SHA-256: 185eac6c87698886c6fedaff9c673dc2507b6110b522660a97a83d94001f03e9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of the same malicious infrastructure. The ML classifier also strongly indicated maliciousness, suggesting the primary goal is to redirect users to malicious sites.

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.cc/pify?keyword=call+of+duty+psp+100mb
    • http://wijed.littleannadesigns.com/uploads/1/3/0/8/130874359/9431323.pdf
    • http://tegorug.aatfchicagonorthernillinois.com/uploads/1/3/0/8/130814328/be3202e.pdf
    • http://files.dianebattistello.com/uploads/1/3/1/6/131636935/8282137.pdf
    • http://todaxav.trinitytraditionaltrio.com/uploads/1/3/1/4/131406086/vovavatogumamo_wujeba.pdf
    • http://files.woodbourneknysna.com/uploads/1/3/0/7/130775308/240a8db6273fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/pronunciation_exercises_esl.pdf
    • https://cdn.shopify.com/s/files/1/0433/3489/3718/files/furojidasizunutatijoder.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/rukubudutis.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/49181508882.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/kipusidexigonanesep.pdf
    • https://cdn.shopify.com/s/files/1/0449/8112/5278/files/bye_bye_blackbird_miles_davis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7655/files/13345106857.pdf
    • https://cdn.shopify.com/s/files/1/0454/8486/7736/files/95598018024.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/zepinozazomemukozeri.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/tumat.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_off00004606.bin
74f38ab4102966ac96414aed81afb3aed2b51fcaa94034d6d16a14a75b4a8e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4606 5160 bytes
font_01_sfnt_off000057a6.bin
2ac1c152a6154706ffb78cbf5b625b604cbc64e9ea3136602baf90fe57c8bd40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A6 9804 bytes
font_02_sfnt_off00007943.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7943 4324 bytes

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