Malicious PDF — malware analysis report

Static analysis result for SHA-256 085a0d9404c8465c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-15 00:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fecca0d99a98f61d5e0812afbc8f6da8 SHA-1: ffc2041b7a6cb2fe99ba9fc94b78848a880d7e60 SHA-256: 085a0d9404c8465cccdd4ff08fab857ac6b46ca554c8e591043ef620310dc1eb
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Spectrum streaming tv guide' and the malicious URL, suggesting a phishing or scam lure. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document, likely intended to redirect users to malicious 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.cc/pify?keyword=spectrum+streaming+tv+guide
    • http://wofasura.jaeceeraeofsunshine.org/uploads/1/3/0/8/130814011/4195491.pdf
    • http://files.theshakercraftsman.com/uploads/1/3/1/0/131071067/fusekij.pdf
    • http://files.cognatecollective.com/uploads/1/3/2/7/132740852/rixolipaboxub.pdf
    • http://zejen.laurapetrisin.com/uploads/1/3/1/8/131856772/xamuti.pdf
    • http://files.joelcressman.com/uploads/1/3/1/4/131437380/tisojorefili_sakufuzuloluj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0450/1922/files/taps_sheet_music_trumpet.pdf
    • https://cdn.shopify.com/s/files/1/0439/2386/5768/files/management_of_international_business_operations.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/cpr_guidelines_2018_uk.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/78784515525.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/4425499492.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/bisadakenoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/guwaxabewagimurarofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/setelidirafavabitafonos.pdf
    • https://cdn.shopify.com/s/files/1/0440/4979/3174/files/66560301908.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/92890540859.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/93359902939.pdf
    • https://cdn.shopify.com/s/files/1/0440/4579/5493/files/marriage_contract_sample_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/55425933668.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b4.bin
d048fe4f61c10b00224b1485d3a6ff9cf2b241bb6f6533f2ce04af0df0311b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B4 5524 bytes
font_01_sfnt_off0000776d.bin
cff4e21580cf371270829bf952f7acce2d65f21efbccdf0c6f3f97b1f619ff76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776D 10684 bytes

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