Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9f62451c349f45…

MALICIOUS

PDF

42.2 KB Created: 2020-08-18 23:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1e46a914bfca161c58ef5690c8719e SHA-1: c223e55351f0102da55a81da8a7f2e679f421460 SHA-256: ea9f62451c349f45832eabc594578668406bc8bd7ad029a6ee0ab9b603c6cef3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to a high ML classifier score and the presence of numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=alderbrook+school+6th+form'. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify-hosted PDFs, likely an attempt at SEO manipulation or to distribute further malicious content. The document body contains garbled text but includes the same redirector URL.

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=alderbrook+school+6th+form
    • http://files.rumbleandresist.net/uploads/1/3/1/8/131856723/a63c21a4d4.pdf
    • http://files.ftcroboticsedina.com/uploads/1/3/1/3/131383665/2ef797dc42c3e34.pdf
    • http://birude.liveandwincoaching.net/uploads/1/3/1/4/131437987/c9edf3.pdf
    • http://files.en.skydivevoss.no/uploads/1/3/1/0/131069763/e0c924ced34d26d.pdf
    • http://files.wholeheartedsolutions.com/uploads/1/3/0/7/130775103/2b63add8635103.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/wiwokeniriga.pdf
    • https://cdn.shopify.com/s/files/1/0439/4637/7374/files/41863130853.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7152/files/masorozoweb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/4340569717.pdf
    • https://cdn.shopify.com/s/files/1/0451/7547/2279/files/cellular_physiology_and_neurophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0433/1733/0075/files/effects_of_globalization_on_zimbabwean_culture.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3901/files/makalah_aspek_keperilakuan_pada_etika_akuntan.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/22347200292.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/spatial_analysis_esri.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/57629240553.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/vexej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/78592013181.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/
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/78592013181.pd

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059c4.bin
a7b545d34d213b60e3f585c1d42e3923a4e408950081f0d6dc3b69628577e646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C4 5032 bytes
font_01_sfnt_off00006adc.bin
2f37bb4b429e71786eda1a6939e538541261d098f2954109bf8d5986c5026d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADC 10244 bytes
font_02_sfnt_off00008de1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE1 4324 bytes

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