Malicious PDF — malware analysis report

Static analysis result for SHA-256 446d906f4de2122a…

MALICIOUS

PDF

35.1 KB Created: 2020-07-31 20:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe491cdba3a5d11f56fd68195680830 SHA-1: 3cbc13d5e95fa6dea33df39eb4d7f52a145c33c3 SHA-256: 446d906f4de2122a5197c6ddce65cea3f31ad4fa1162bd9a03588a86396524c1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, characteristic of a link farm designed to manipulate search engine rankings or distribute malicious content. One of these URLs, 'https://ttraff.cc/pify?keyword=ski+doo+mxz+trail+schematics', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm structure strongly suggest a malicious intent, likely to lead users to harmful websites.

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=ski+doo+mxz+trail+schematics
    • http://files.meagafit.com/uploads/1/3/2/8/132814680/konipuguriga.pdf
    • http://files.roxieriverawriter.com/uploads/1/3/2/6/132683000/kalop.pdf
    • http://files.snowangelsiberians.com/uploads/1/3/1/4/131437276/5aadf27.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/napabonefipuvalapewefigek.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/3477655008.pdf
    • https://cdn.shopify.com/s/files/1/0438/3067/3565/files/sabezabivuminis.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/88451783770.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/44262805293.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/47968128898.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/98822780629.pdf
    • https://cdn.shopify.com/s/files/1/0433/6559/7342/files/sanerasim.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/jozipifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/posowawemikorenetirobomok.pdf
    • https://cdn.shopify.com/s/files/1/0430/4912/3993/files/jupalirorobegopipu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aa2.bin
30f1a2f8295c8e3c1ab810a63da7fb6329b0bb995fc0d6ca214f205493b6fa56
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA2 5464 bytes
font_01_sfnt_off00005d15.bin
32781530a6489c60a8bff58b94e517af704574ea87d07deaacd37dd5e3a50d96
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D15 10224 bytes