Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34345c4efb7c223…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 17:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ddafe1471c7eca7b27356f4e2cf3b3c SHA-1: 68cd108a304a0b356824b21e63f53e8a0ed31c80 SHA-256: c34345c4efb7c223ba01882a8ccd4faa29f00d23a4f770d43d25e7276bafec4c
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at ttraff.cc. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary goal is to lure the user to a malicious site, likely for further exploitation or phishing.

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/wix?keyword=spanish+alphabet+pronunciation+chart+printable
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/link_video_er_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/75572432689.pdf
    • https://cdn.shopify.com/s/files/1/0430/9198/4535/files/pitoxinurizebuxekuvagidug.pdf
    • https://cdn.shopify.com/s/files/1/0460/1371/0503/files/dungeons_and_dragons_3.5_complete_warrior.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2245/files/fozisub.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/robust_nonparametric_statistical_methods.pdf
    • https://static.usrfiles.com/ugd/8ab72e_682d7c7d24484bbaa973375958f4909d.pdf
    • https://static.usrfiles.com/ugd/7f16bd_113069058341457b86c39ea236174031.pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/fiwanujimetamuzupesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.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_off00006001.bin
b804051ae18bf6452dfe26c26cd3024402160efe71f5f81447330ad5c0c94131
pdf-font-stream PDF embedded font (sfnt) at offset 0x6001 5264 bytes
font_01_sfnt_off000071cc.bin
a352fb2f3f6fdb4e797633748cd54a6ed1269a19bd2a85d7637c62169c8ff6df
pdf-font-stream PDF embedded font (sfnt) at offset 0x71CC 10632 bytes