Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a68abe00452cd6…

MALICIOUS

PDF

55.7 KB Created: 2020-07-20 23:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c732a34d6c2c221a1827b1c34ca77979 SHA-1: c473a2f1776212bbeb816c959e22006b9629bb8e SHA-256: c7a68abe00452cd6605b1b2fa37fbff61b863269ca6e826619bc826c3b79b560
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=memory+leak+android+bitmap'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO poisoning or malware distribution. The ML classifier strongly supports the malicious nature of the document. The document body, though heavily obfuscated, contains keywords related to 'memory leak android bitmap' which likely serves as a lure.

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=memory+leak+android+bitmap
    • http://files.100x35online.com/uploads/1/3/1/3/131384638/miweguvaj.pdf
    • http://files.braaibeque.com/uploads/1/3/0/7/130775174/3392100.pdf
    • http://files.mytriplec-boutique.com/uploads/1/3/1/4/131454503/c32406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/42382728522.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/89046499419.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/gogobuzubimilimolozeg.pdf
    • https://murulejam.files.wordpress.com/2020/06/23200236578.pdf
    • https://zefumonale.files.wordpress.com/2020/07/48747659874.pdf
    • https://bejanatu.files.wordpress.com/2020/07/13546588067.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/fokajusafun.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/21072752757.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/17445844926.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/12539976319.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/volobufepafolosovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/dusidabad.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/83512182111.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_off00009409.bin
dcd6bb4703887ce6b1f5855f27277d0ca9540a2d23dca5d99063670d64cdbe78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9409 5024 bytes
font_01_sfnt_off0000a507.bin
685b539d54297cbd1267bb2c3bf441a40d89258e61595c9edd6367e2e8570587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA507 13772 bytes

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