Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93bfa8cd42790b2…

MALICIOUS

PDF

38.2 KB Created: 2020-08-18 23:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e8a81b6176792d8996bb1b88a756c3d SHA-1: cc1f43a996cf1bfc24afbc1232c0475ffec126f7 SHA-256: a93bfa8cd42790b2c6f2593edab8f06b7d3954b28f259d47923fedad3b865573
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=amagama+medley+free'. Additionally, the document exhibits characteristics of a PDF link farm, with numerous links pointing to external PDF files hosted on domains like cdn.shopify.com and others. The ML classifier also 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.com/pify?keyword=amagama+medley+free
    • http://zuponogo.coloringbright.com/uploads/1/3/2/7/132740541/kedepoduvofare.pdf
    • http://files.hisheartcalls.com/uploads/1/3/1/8/131858044/a870507b.pdf
    • http://files.thatvintagesite.com/uploads/1/3/0/7/130775633/pelukeruxuso_delitexa.pdf
    • http://files.charlestonctc.com/uploads/1/3/0/7/130740591/bokob.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/fuwepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/40440761287.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/71932548818.pdf
    • https://cdn.shopify.com/s/files/1/0433/5956/8027/files/chapter_8_sensation_and_perception_vocabulary_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0507/files/gaming_buddy_pubg.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/40363491274.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/jojezedidakadunosobodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/jujobivegubijelugamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/49819083826.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/anatomy_and_physiology_nervous_system_notes.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_off00004a84.bin
e1cffc957d5d35e49872dbb6f4ff6517852360a6e67eb3dde2f02e1ef67bbdfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A84 5140 bytes
font_01_sfnt_off00005bed.bin
52eb3bf8b0271494a3bc8b424cbfb776cbea10ee22a231586dcde0c648394038
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BED 15120 bytes