Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92bc1b429a5f37d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 00:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1444f400684d1b66c8edb3a282f478a3 SHA-1: 87225098c0faabf020d56f849d35d38f55430a04 SHA-256: a92bc1b429a5f37d4da0377798a748d6ddb94b5dcd64d4dc99c45d7abccc288a
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector (ttraff.com). This suggests the document's primary purpose is to lure the user to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning tactic to obscure the malicious destination. No scripts were extracted, but the critical heuristic firings strongly indicate a malicious redirection attempt.

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=baby+songs+in+tamil+free
    • http://jimuxa.httiphila.org/uploads/1/3/0/7/130776485/7481910.pdf
    • http://files.aspectsmediaimaging.com/uploads/1/3/2/6/132683014/236d6312ef701b.pdf
    • http://files.erichber.com/uploads/1/3/2/3/132303378/ponosezixiwok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/82065124586.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/77855131194.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/32370145526.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/56294527429.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/95576105119.pdf
    • https://cdn.shopify.com/s/files/1/0437/2856/8474/files/morphology_affixes.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1774/files/nefezeluruvafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/83583068491.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/52893060446.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/55762936657.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/gesture_app_lock.pdf
    • https://cdn.shopify.com/s/files/1/0435/7092/1635/files/template_for_discontinuation_of_services.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_off00004e42.bin
e557dadaa342d08a15d94940993e95f6e2be927c22caff4b521a2a68565ad8bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E42 5376 bytes
font_01_sfnt_off00006073.bin
ebeda0268970634c37a29684800a1d77bfc0a686f5da4fd287dc5e226010ff14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6073 6140 bytes
font_02_sfnt_off000072c8.bin
23829476ae81abce0930ba4f8fdf0be52240a6f0a66580764f037b59b12e6284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C8 9788 bytes

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