Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ad41bb69f96a0d…

MALICIOUS

PDF

42.3 KB Created: 2020-08-13 23:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a97fe45866be19e7f88ce95b26fcde SHA-1: ac7b6eb162aef915aa502914238a2828b834acbc SHA-256: 61ad41bb69f96a0d0d01e5913408dc41da7d5ab25aaefcc31895af64d03b8ccd
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the target URL and appears to be a lure for 'chimborazo climbing guides'. The presence of numerous external PDF links suggests a link farm or a method to obscure the true malicious destination.

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.com/pify?keyword=chimborazo+climbing+guides
    • http://files.larryssportsexchange.com/uploads/1/3/0/8/130874128/folerezome.pdf
    • http://files.stspain.com/uploads/1/3/0/8/130814169/kabofegizozoben.pdf
    • http://files.hugsforhounds2.ca/uploads/1/3/2/8/132814935/vigajosejelavujafu.pdf
    • http://files.barringtonboosters.org/uploads/1/3/1/4/131483603/fe5d31f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/cambridge_primary_science_activity_book_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/vetimupel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/4062378680.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1913/files/64022653998.pdf
    • https://cdn.shopify.com/s/files/1/0431/4641/2188/files/55233711012.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4557/files/62337252784.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/nafojof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/risk_assessment_methods.pdf
    • https://cdn.shopify.com/s/files/1/0434/9054/1733/files/ragoligavofemilovunobid.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/93607634997.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_off0000676d.bin
04cfd750857bdbe790fdf240ef07e5dc585daa5355b11e9fd1337f5c3be57c0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 5448 bytes
font_01_sfnt_off000079be.bin
1ac38dfb5c426b93a11a191c89498b39c3f199e4866e48adeb03ad239dc3516e
pdf-font-stream PDF embedded font (sfnt) at offset 0x79BE 10216 bytes