Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e978b5e502f6374…

MALICIOUS

PDF

44.4 KB Created: 2020-09-07 16:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a140c3c68db26bc27376aa25cd4a8d2 SHA-1: 66a7641a570be09ca0f30ba7dc30a1a96bd0c3e3 SHA-256: 1e978b5e502f63748abe4aee88ce8c6d1b1528bafc0a7bd3d6d668b06079d5e1
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a printable worksheet, likely a lure. The PDF also contains a large number of external links, many hosted on Shopify, which is characteristic of SEO-based link farms used to distribute malicious content. The ML classifier strongly indicated maliciousness.

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.me/wix?keyword=house+chores+worksheets+printable
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/fivotegexuputomevapitata.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/reset_echo_dot.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/kingdom_hearts_2_ps4_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/68054974869.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/latest_movies_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/93975945633.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/92798476726.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/93700285606.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ee411929aed468eaa0a2edda25113f1.pdf
    • https://static.usrfiles.com/ugd/5a1791_6af5a29858944b3fbae179548169f997.pdf
    • https://static.usrfiles.com/ugd/76de1a_1ffd73f48f854121b284e80a648b7fc2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/berner_20_joints_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/9180078521.pdf
    • https://cdn.shopify.com/s/files/1/0435/5185/0647/files/hands_on_blockchain_with_hyperledger_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0463/7815/6187/files/aranmore_catholic_college_uniform_shop.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/51083254965.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_off00006c33.bin
0ad5865a40ff1bdd733d6327fa024f25040805ad90ca0aa055088ee41f5499fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C33 5280 bytes
font_01_sfnt_off00007e2c.bin
951212be042d2ab210ffa76c9658a4f13f6da046eba29ce01512f6da900171cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2C 11196 bytes

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