Malicious PDF — malware analysis report

Static analysis result for SHA-256 561f1ebdee1d12a7…

MALICIOUS

PDF

46.1 KB Created: 2020-08-07 05:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17332f579e082adb0121b2e6b2620307 SHA-1: c5c60035ea6a812d234f69435478ddff8abcf90a SHA-256: 561f1ebdee1d12a7973eabcab0d7adc01bdb93de827c61d5844b69f9f78f2afe
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=andrew+scheer+platform+pdf'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a social engineering 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.ru/pify?keyword=andrew+scheer+platform+pdf
    • http://files.maplegroveumciowa.com/uploads/1/3/1/4/131452750/nusolopipasiwine.pdf
    • http://files.3minuteswest.com/uploads/1/3/1/3/131383619/4999763.pdf
    • http://bafos.calgarypartybus.net/uploads/1/3/0/7/130775934/xebapuvesekezebepa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/conjunction_exercises_for_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/5934/6599/files/wizegowofopokirar.pdf
    • https://cdn.shopify.com/s/files/1/0428/4642/1158/files/bloatware_android_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3415/files/72410988157.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/2145158092.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6507/files/29337582317.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/emerald_tablet_text.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/nugenenatomafeme.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/pokixalavonupiwigarizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/25429548033.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/jufotudepetema.pdf
    • https://cdn.shopify.com/s/files/1/0433/8732/2522/files/lifefofusemofulitasunav.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_off00007713.bin
064dc8a7fa3baf5bff38d27c40aeef89e82d7f54d663a473a4b3afa6da865292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7713 5476 bytes
font_01_sfnt_off000089a1.bin
5286145d3bc61653580c64b56d4423ea525bd7d50bd125c283ad649edc428190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A1 9748 bytes

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