Malicious PDF — malware analysis report

Static analysis result for SHA-256 7816df4b62f3f6e3…

MALICIOUS

PDF

45.4 KB Created: 2020-08-14 02:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a2a366a6d9ff5a173123a82cf7f9f6 SHA-1: c834e409b07ee2ffba9aa149c5863e1653597eeb SHA-256: 7816df4b62f3f6e32b7c0e528c68d14a9bf0af358c575122d381d58774c84bf2
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link to a known malicious domain, indicating a phishing or scam attempt. The document body, though partially corrupted, contains text related to a Mercedes car and a URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=mercedes+glc+coupe+350d+performance
    • http://files.uptowngalleryoffranklin.com/uploads/1/3/1/6/131606984/4073671.pdf
    • http://files.barbaraumbel.com/uploads/1/3/1/4/131407263/936961.pdf
    • http://fimilojul.liosch.com/uploads/1/3/1/3/131398101/7014972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/xesamilamesezutojakaru.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/average_velocity_and_instantaneous_velocity.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/34576522273.pdf
    • https://cdn.shopify.com/s/files/1/0432/2836/4968/files/50058094159.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/wufuderiwenizowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/21950344998.pdf
    • https://cdn.shopify.com/s/files/1/0437/3322/1527/files/renaissance_periodization_diet_free.pdf
    • https://cdn.shopify.com/s/files/1/0444/7014/1095/files/80204421383.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/gemisotaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/accidentes_de_trabajo_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/taco_bell_nutrition_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/jupokitofa.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/44874281781.pdf
    • http://www.sololearn.com
    • 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_off00006dc0.bin
ff714bc68ad6341f398ba2d83aea6a462b81a7c43f9df582c0dff29fea904f37
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC0 5908 bytes
font_01_sfnt_off000081d2.bin
ffd063b06c548f3d86dcd3d015420b8e18a4f1683278b37ff12102a2a92b56e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D2 11988 bytes