Malicious PDF — malware analysis report

Static analysis result for SHA-256 a067f6ae1a53cde0…

MALICIOUS

PDF

52.0 KB Created: 2020-08-23 18:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8809dff5968c09b83b00eeced3bb86 SHA-1: ae19d8ef3331c84077f92e6181ac02501412d80f SHA-256: a067f6ae1a53cde040b524e1d7ef5d6ed241563d3cfb8811a0265eb3812cfbf2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirect. 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=stellaris+vassal+guide+2.+0
    • http://files.olneyartscouncil.com/uploads/1/3/2/8/132815008/gujotovexowegemapu.pdf
    • http://files.akcentkafe.com/uploads/1/3/1/4/131438379/335437.pdf
    • http://files.mrsparsons.net/uploads/1/3/1/4/131406831/zuzap-roporoli.pdf
    • http://files.smoothguide-mahjong.com/uploads/1/3/2/6/132696233/pokim.pdf
    • http://files.ruskinhouseofshepherds.com/uploads/1/3/1/4/131406182/7117510.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/vijunowubilazi.pdf
    • https://cdn.shopify.com/s/files/1/0446/5560/7971/files/request_letter_format_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/99527612447.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/pelivofixeno.pdf
    • https://cdn.shopify.com/s/files/1/0437/1726/3510/files/33194513742.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5749/files/money_manager_badge.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0960/files/rodas_da_vida_anodea_judith.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/59483813393.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/1132717223.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/etymological_dictionary_of_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wopesutokuvikoku.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/giputiravimiwig.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_off00008d32.bin
a47e4fd98ba14493095a0c2914bf5a3fadd2fbb4bf869629857e75df2081cf90
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D32 5464 bytes
font_01_sfnt_off00009fd4.bin
fb4da1d799e0e31d1e394715e8490c5732cfd00d4b8d091a65f4a4ffc0df3b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD4 10336 bytes