Malicious PDF — malware analysis report

Static analysis result for SHA-256 85be25ed2c06d1ec…

MALICIOUS

PDF

55.3 KB Created: 2020-08-21 23:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aea79217a3c6403171ef228aee0a2ed8 SHA-1: 99232eccd69c218087a86e5ded1de4c0bf0cc2c5 SHA-256: 85be25ed2c06d1ec42405c996766fd39cf03982b6fe7f72f7b3f34e86d402dc0
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links, https://ttraff.cc/pify?keyword=rudram+chamakam+pdf+tamil, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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=rudram+chamakam+pdf+tamil
    • http://files.ywamexperienceasia.com/uploads/1/3/0/7/130740025/pemamikuwozuponi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/22859789055.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/zekepojaluziselekonivax.pdf
    • https://cdn.shopify.com/s/files/1/0451/1855/4266/files/pefiruboviwoderozure.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1721/files/susaminewedowisuwikalefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/pexodetofepajawawitesodu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/case_for_faith_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/jejavidedubejikoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/wipitivikumajedoxa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00007264.bin
ad41c4b8aba0bdb8e47637ff0bbad0fc5c05dbce0de0958030e1c7b96824e8fa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7264 10888 bytes
font_00_sfnt_off0000608f.bin
973ce1845a3fe0ac7540d44ec262b090b88971f656ffe17adaf5502e9228af55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 5288 bytes
font_02_sfnt_off00008e0e.bin
f8040768827b7d695468c490d59dad1043a597ca80365c8adca956a00e8b5e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0E 14596 bytes
font_03_sfnt_off0000bb18.bin
06d84a79787f49517cba9647d12dd77c675544b9e46e70dbd0c3ec2b8d2a160e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 16132 bytes

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