Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c27f5f9ab0261f6…

MALICIOUS

PDF

40.7 KB Created: 2020-08-13 05:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ab1bf152e9d7f2173a4a7a16f52daf SHA-1: 332d3bafa15729ee4649f6ee5d0b4283588422e6 SHA-256: 0c27f5f9ab0261f68813d61cd5567c451bf0fb52aa149d1215408bd689b96c1b
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 pointing to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify. The document body, though heavily obfuscated, contains references to 'stamford alternator catalogue pdf', suggesting a lure to disguise the malicious intent. No scripts were extracted from this sample.

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=stamford+alternator+catalogue+pdf
    • http://files.fixmyscrubber.com/uploads/1/3/2/6/132681855/lanafoz.pdf
    • http://files.harlanparkbaptist.com/uploads/1/3/1/4/131454012/c66d0bfd.pdf
    • http://files.jrlakemen.com/uploads/1/3/0/7/130775712/a18d16ef.pdf
    • http://files.chestertonantiquemall.com/uploads/1/3/0/8/130873708/4280704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/wamulokixuvudevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/caterpillar_generator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2555/files/68780339519.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/lanric_cable_ladder_catalogue.pdf
    • http://files.armen.people.ua.edu/uploads/1/3/0/7/130775953/1e8fc0a904b.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/simirerexin.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/10492272009.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/21508942829.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9621/files/jojotivodivuzejedowovuro.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/beluduzut.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/wufakitataxarifeto.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_off000057a5.bin
0c8efd48f1e826337b2fdbdb8c3b6e999ac478cd1055f48fbfc16669752dca1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A5 5400 bytes
font_01_sfnt_off000069e7.bin
d756436af80f6ad5814844663f51d5026d41bb7a2113c21545fb60d934997e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E7 13848 bytes

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