Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c4e2cf00da79fc…

MALICIOUS

PDF

51.5 KB Created: 2020-08-02 14:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5fc9c98155d1a7946e327417612c7d9 SHA-1: a9adfcf9596baa80ecd04a2676e355f99d0f65b2 SHA-256: b8c4e2cf00da79fcac82eeb490f5ab8506d6fd48ee0bddf5431cd86b9d618886
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. Several of these links point to a redirector service, and the document appears to be part of a link farm designed to lure users to malicious content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=poe+flask+crafting, which is likely used to distribute further payloads.

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.ru/pify?keyword=poe+flask+crafting
    • http://files.be-you-tiful.me/uploads/1/3/1/6/131606393/589259b.pdf
    • http://files.shawngrewal.com/uploads/1/3/0/7/130775653/c3a6276.pdf
    • http://files.teachcruachan.com/uploads/1/3/0/8/130813913/3939c9.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/depawal.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/73363128569.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/wejezelurovidak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/microsoft_time_server.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/17809416500.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/zokirekun.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/48414298897.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/30586081690.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/jokefotoxuza.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/27361877373.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/fisidogoxuxuzapanavi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5942/6968/files/anakin_midichlorian_count.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/96203662281.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f00.bin
ad1e9c77c9edcf918d70de7f735d4efc8d89c00dce6427234d230bbc2e513633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F00 4904 bytes
font_01_sfnt_off00008fb2.bin
1c715a25f13dd63f689edf317d56aacd8f9c8c65eb3fed7548fc052fa115063e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB2 10376 bytes
font_02_sfnt_off0000b329.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 4324 bytes

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