Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e5508a42f40e5f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 21:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3440b2529eb69d4c3abdaec982f6df86 SHA-1: 0da187a5423f4e9985046c30fe1943a10bfd018f SHA-256: 41e5508a42f40e5fffb735a120a89b8daf67afcc6af83a76939a68b2e58dce9c
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text and URLs as found in the heuristics. The primary attack vector appears to be a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

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/wb?keyword=guru%20mann%20shredded%20program%20pdf
    • http://files.leveluphealthandwellness.com/uploads/1/3/1/8/131856713/625bf1d5d53d1.pdf
    • http://files.laurenhendersonmusic.com/uploads/1/3/0/7/130739783/79b4a.pdf
    • http://nusesi.decoratorinwiltshire.co.uk/uploads/1/3/1/4/131453494/fitege.pdf
    • http://files.morschmachine.com/uploads/1/3/2/7/132740204/3d598efcc9c9.pdf
    • http://files.malowiaguesthouse.com/uploads/1/3/1/4/131437515/1769872.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/kibavizurunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/liradazifetojizufat.pdf
    • https://cdn.shopify.com/s/files/1/0430/9476/9821/files/english_short_stories_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/47478922653.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/bewiditop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexigubozorabavajodumixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/raroxeridufukelakupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/batman_who_laughs_comic.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/minecraft_usernames_and_passwords.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/panij.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/gubagi.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_off00005f1a.bin
5bee22b72ef398e872df685b54acf95512465c0561f7e6fe811ad748567e5388
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1A 5452 bytes
font_01_sfnt_off00007175.bin
29b647a51ea6e9294508470c5ec658f857a480478ec0572a4d6582dbd05be5d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 10596 bytes