Malicious PDF — malware analysis report

Static analysis result for SHA-256 40849c7e4f29f285…

MALICIOUS

PDF

39.2 KB Created: 2020-08-14 01:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f24a85cafdca3ff70f9e09572fb45a35 SHA-1: f44ca9845278525fe89a879af913f0900b3b3cdb SHA-256: 40849c7e4f29f2851b0e0d55e08b53544fd05ae291f61dc486b34e5779683ffe
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One critical heuristic indicates the presence of a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=cycling+jersey+template+eps'. Another critical heuristic identified a PDF link farm with 17 external links, many pointing to shopify.com domains, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted from this sample.

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=cycling+jersey+template+eps
    • http://files.homenikdoor.com/uploads/1/3/0/7/130739982/b156d11283d47a9.pdf
    • http://kupoba.melanieparish.com/uploads/1/3/1/4/131408738/wewataselilimum_serepupij_noboxiwipad.pdf
    • http://files.pro-help.co.uk/uploads/1/3/0/7/130776887/6506850.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6465/files/systolic_and_diastolic_heart_failure.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/favagigisowotagozolevifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5880/files/93741433270.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/lofijejobekawanubasezas.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/78810762534.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4005/files/gepawudugulilafepiwijowab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/wituk.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/35994002393.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/82782917185.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/aspiration_pneumonia.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/ffx-_2_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/ginudogaludelidisawawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/76736057955.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_off00005104.bin
276a89e38ecbcd25057c7dcc49456e79918cab7efea8df12ad219fc7c5956b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5104 5336 bytes
font_01_sfnt_off00006317.bin
d62807743259c8e14f91b4e15c2f39145e3cae42acf959a5bff4846e298a6405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 14540 bytes

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