Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d780c7a1a85425…

MALICIOUS

PDF

52.8 KB Created: 2020-08-20 23:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1930ab2e6f88b7822caffa8b76fb2c5a SHA-1: ef38d3e714a6d1d38628d1209a88f1f4b37596a3 SHA-256: 77d780c7a1a8542582bb050554f5b2cc2d56acc83169baa6d7212e5ed554d63a
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body also contains a URL that appears to be part of a link farm, further suggesting malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=balance+of+power%2528+1990+edition+game
    • http://files.heavydutykeychain.com/uploads/1/3/1/4/131483343/7583381.pdf
    • http://ragum.empiredanceco.com/uploads/1/3/0/7/130738902/6799102.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakisone.pdf
    • https://cdn.shopify.com/s/files/1/0435/8547/0627/files/varirusisubobafivoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/38055118478.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2415/files/kajasumufilirakisani.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/amablesser_lyrics_video.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/71229777012.pdf
    • https://cdn.shopify.com/s/files/1/0437/4819/6506/files/adding_decimals_horizontal_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0464/8232/5672/files/bharathiyar_logo_images.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/texubibozexapokipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/73587469612.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4861/files/neural_tissue_histology.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/jowerifufativosazepeme.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/jenuli.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_off00008d4a.bin
f5eff96ac17853e8f403e5813b5a4e6f0fd49d10e0349a4d988b054c2d98eb39
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4A 5868 bytes
font_01_sfnt_off0000a150.bin
e221cebf5e5d5c25bc0f3af8958ac0ea5a7ae3657b8ad647ddd9b0cc21f06324
pdf-font-stream PDF embedded font (sfnt) at offset 0xA150 10676 bytes