Malicious PDF — malware analysis report

Static analysis result for SHA-256 7103c125d647f397…

MALICIOUS

PDF

46.9 KB Created: 2020-07-29 14:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f153440fd8785047baab565a0267c8fe SHA-1: 7535d3d56ead093ff0f6e88ea6c644a11a89f14c SHA-256: 7103c125d647f39717a35207f4e0d0516e7969b58ea93996b9813927915d8d80
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 specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be related to a dictionary PDF, likely a lure. The presence of numerous links suggests an attempt to drive traffic to malicious sites, potentially for phishing or malware delivery.

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=dicion%25C3%25A1rio+caldas+aulete+pdf
    • http://files.dwfashions.org/uploads/1/3/1/3/131381021/ruwilezirizigir.pdf
    • http://files.sutherlandbeatson.com/uploads/1/3/1/6/131606875/jirekomiv-morilewurewox-vakezuvevobido-welos.pdf
    • http://files.ponderosa-dance.de/uploads/1/3/0/8/130874394/2711243.pdf
    • http://files.thelovingpath.com/uploads/1/3/1/4/131407388/kaguboxalaka_wuvilizore_megatasopepidas.pdf
    • http://files.primo-pc.com/uploads/1/3/2/6/132695829/5946754.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/zipode.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/20274386353.pdf
    • https://cdn.shopify.com/s/files/1/0438/3873/4496/files/vukasepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/11666203833.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/visimuguze.pdf
    • https://cdn.shopify.com/s/files/1/0433/7490/3452/files/72832393877.pdf
    • https://cdn.shopify.com/s/files/1/0436/2082/7300/files/dimubisazugefosixupijodow.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/81602931300.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/24092493061.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/60971522548.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/sikegawojulebumabasejifad.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/49662707232.pdf
    • https://cdn.shopify.com/s/files/1/0435/6135/3371/files/tuvolowodeteduf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/bidutumifenemavope.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/81781547135.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_off00007392.bin
44e3fbe2f7cc037b69f6400384e3a10982810038d1b92ab1bb7605dbd538d634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7392 5264 bytes
font_01_sfnt_off000084f0.bin
140e474c1d073bfaa3ddda8781bd044f773672c0999144f2911bdd3adc1a62b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 13028 bytes

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