Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c45e011139a5fdc…

MALICIOUS

PDF

41.7 KB Created: 2020-08-23 01:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0f4cf71942335219b00ebe147153b6 SHA-1: c7e321607727c4599a863daafb2817f9e8b08fa5 SHA-256: 5c45e011139a5fdcec1d9c915f131bb492fb48bdf51deedda2ceba710b8eb518
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=sample+background+check+release+form+template', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a 'sample background check release form template'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm intended to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=sample+background+check+release+form+template
    • http://files.dr-yakirov.com/uploads/1/3/2/7/132711983/fijazegeriduzos-bexotudijufupu-terivoj-sinoro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5282/6777/files/zobivasuwibule.pdf
    • https://cdn.shopify.com/s/files/1/0461/4268/5337/files/24340330250.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/reboxogiwifenopawaga.pdf
    • https://cdn.shopify.com/s/files/1/0462/3033/9735/files/jewakiwasojalowipidomajab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6395/1003/files/bladder_training_with_foley.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/failed_to_save_server._properties.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/6701976454.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/applicant_s_parent_spouse_information.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2785/files/sukozevegemisobokekuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/nahuales_mayas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/gafojiwidojoxasub.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_off00006419.bin
c1180ed633f6e56adbe80e7e26f22308582d34147d7b491e114a7ab114785550
pdf-font-stream PDF embedded font (sfnt) at offset 0x6419 5876 bytes
font_01_sfnt_off000077e2.bin
75c125e383f68da9cee6af8eade64106c88c02d6397aba59417c790f0ac472ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E2 9972 bytes