Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b4038200f18d02…

MALICIOUS

PDF

60.6 KB Created: 2020-08-13 14:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68474a927559ccb8f6978c37e97d8e66 SHA-1: 0de6fa8fc3941a7d74893c12c5dae8af4bcab384 SHA-256: 71b4038200f18d02dd6c9e367bf697d868a1c5f9054066b35197e5cf529218fb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'family and friends 5 workbook answer key pdf'. The presence of a malicious redirector and a large number of external links points towards a phishing or SEO-based malicious link distribution scheme.

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=family+and+friends+5+workbook+answer+key+pdf
    • http://files.thefordhambleat.com/uploads/1/3/1/3/131380756/sujudiriz.pdf
    • http://files.necfgsd.com/uploads/1/3/2/7/132710671/735fe631596792c.pdf
    • http://pinav.graniteexpomn.com/uploads/1/3/1/4/131482975/kinidut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/27132963657.pdf
    • https://cdn.shopify.com/s/files/1/0439/2691/3179/files/beginners_python_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/87032034236.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/18105564263.pdf
    • https://cdn.shopify.com/s/files/1/0432/7332/2664/files/hyena_word_generator.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/68929083624.pdf
    • https://cdn.shopify.com/s/files/1/0444/2229/9815/files/bncc_ensino_fundamental_mec.pdf
    • https://cdn.shopify.com/s/files/1/0429/4397/1484/files/pibokopevipeso.pdf
    • https://cdn.shopify.com/s/files/1/0435/7750/7999/files/que_es_isquemia_cerebral.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/nelalexelugodozobimiwujin.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_off0000adfa.bin
2e11064cb1a72d864847ec795c579b079bfa0883a242706b14c91d5cab1e1e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xADFA 5664 bytes
font_01_sfnt_off0000c142.bin
3851ccff21e910c1537362d6ba53e0bb5c0cf5663f602747f0c73509de1d8426
pdf-font-stream PDF embedded font (sfnt) at offset 0xC142 10520 bytes