Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd24b40c6ca33a…

MALICIOUS

PDF

44.6 KB Created: 2020-08-20 04:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36584f1cb2d88711418b312691d6d19d SHA-1: 96ef6b55546614296f982283153c58fab5cef213 SHA-256: 19fd24b40c6ca33afc3932ca3cc3214ca76a7c0245d30b2fdafb51ef6a1dd054
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=battery+tester+app+for+android'. The document body, though partially corrupted, contains text related to 'battery tester app for android' and the authoring application 'wkhtmltopdf', suggesting a lure to a potentially malicious application download or related scam. The presence of numerous links, including the identified malicious redirector, indicates a link farm or phishing 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=battery+tester+app+for+android
    • http://files.centerforwomenfaithandleadership.org/uploads/1/3/0/7/130739073/3696060.pdf
    • http://files.sm4g.net/uploads/1/3/0/7/130776069/743a22486b20062.pdf
    • http://tiwitulu.cyclingsportscenter.com/uploads/1/3/1/3/131383483/dejisedimo.pdf
    • http://legibe.rootboundgardens.com/uploads/1/3/0/7/130776449/3479072.pdf
    • http://files.crittendenhospitalconference.com/uploads/1/3/1/0/131070379/20e6c4efc1f.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/skrillex_scary_monsters_and_nice_sprite_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/pitting_edema_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94192334972.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/daggerfall_install_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9124/7779/files/arcoxia_bula_anvisa.pdf
    • https://cdn.shopify.com/s/files/1/0445/6418/5247/files/speak_english_conversation.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/linux_administration_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/ziziwobunarij.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3829/files/nemobumatasibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/naroz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8167/9523/files/19961255181.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_off000070bf.bin
0a70a6c511e0bcc0552f69a8acbceb297450d4aedc13c70d3b4a42e3b763d459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BF 5152 bytes
font_01_sfnt_off00008261.bin
5d92e77e313ba79e8d828534080111a9522d2b7a3bbf9180364f32a7288ce8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8261 10224 bytes

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