Malicious PDF — malware analysis report

Static analysis result for SHA-256 788770ac5732d3e2…

MALICIOUS

PDF

53.2 KB Created: 2020-07-22 23:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139b3c4d9578dce46aeceff2f4f31a5a SHA-1: e642be949373c9481ac015247b961d141b621cff SHA-256: 788770ac5732d3e2772720d0735d0075c4bcd79d9ae174493a7d2a4d184a4dda
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links, including one pointing to known malicious infrastructure, suggests an attempt to redirect users to harmful sites, likely for phishing or to serve further malware.

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/wb?keyword=mpls%20cisco%20pdf
    • http://files.claraadolphs.com/uploads/1/3/1/4/131407089/juvojenudupinamupado.pdf
    • http://files.spencermanbullies.com/uploads/1/3/0/7/130739139/vemoliv.pdf
    • http://files.mnductpros.com/uploads/1/3/0/7/130738725/931687.pdf
    • http://files.gregpicardandwendypicardgorham.com/uploads/1/3/1/4/131406807/9807030.pdf
    • http://files.ekmcreative.org/uploads/1/3/0/7/130775747/lesefutakuzikuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/45868065752.pdf
    • https://cdn.shopify.com/s/files/1/0429/2290/1663/files/62693810139.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/levenajole.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90142435821.pdf
    • https://gitumonas.files.wordpress.com/2020/07/bigudazifelixuzelaka.pdf
    • https://baboraxotav.files.wordpress.com/2020/06/45462702528.pdf
    • https://xivatuzivo.files.wordpress.com/2020/06/mimufujusifulijusa.pdf
    • https://wogeberej.files.wordpress.com/2020/06/wamiwotavabesaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/99956285032.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93366398369.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/loboxiterawurimul.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/37979095702.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/gulob.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/34099675451.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/10687740685.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/50255733256.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/60197754080.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_off00008a52.bin
f3ec8e19e6088d5d52bf00885b627e02afd79fd04f7349b353e4c0a97b2d21bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A52 4332 bytes
font_01_sfnt_off00009904.bin
1606c740cec2247e0d6a4a374cc50475a6ef3bda9071822594596984601e4e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9904 14456 bytes

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