Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a10921c089ac1cf…

MALICIOUS

PDF

36.2 KB Created: 2020-08-06 00:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3ee7842f38099dc2b81c22bd09c1fbf SHA-1: a3957cfa04673b5d421ed8367ba4bc42f60786de SHA-256: 6a10921c089ac1cf3c2a603af80d102993de588e8a842991a68999d29bc4844c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are hosted on Shopify and appear to be part of a link farm. One of the embedded links, 'https://ttraff.com/pify?keyword=ielts+blank+answer+sheet+pdf', is identified as a known malicious redirector. The document body itself is heavily obfuscated and contains the same URL, suggesting an attempt to lure users to malicious infrastructure. 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.com/pify?keyword=ielts+blank+answer+sheet+pdf
    • http://files.theprestigemaids.com/uploads/1/3/1/1/131164556/2597959.pdf
    • http://files.wechoosetoday.com/uploads/1/3/1/0/131070051/mewakawe_numuluwowokiwa.pdf
    • http://files.bestheatingandairia.com/uploads/1/3/2/7/132740580/tafovawegat.pdf
    • http://files.alignnowphysicaltherapy.com/uploads/1/3/1/6/131606461/8958658.pdf
    • http://files.wulffquilts.ca/uploads/1/3/1/4/131407668/fososupusobigag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/45746180737.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/pifafam.pdf
    • https://cdn.shopify.com/s/files/1/0448/9238/9531/files/possessive_pronouns_examples.pdf
    • https://cdn.shopify.com/s/files/1/0435/3923/4967/files/16469742711.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/nojowadibojumibetowuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3125/7510/files/66151595933.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/bemaposefumokimiboremi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/supixeruwotabudarabixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/falling_action_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/xakulonovumebofaxoronamox.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7388/files/4391345731.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000492c.bin
214940e12dc8b7d27acee28dc31a3a5a1a2c01098edbd98727761a2ef94e3c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x492C 5360 bytes
font_01_sfnt_off00005b6e.bin
383e71742ad5a58089b1b656dd681f921a9b10001cedc39286ce4111f6421178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6E 14576 bytes

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