Malicious PDF — malware analysis report

Static analysis result for SHA-256 743e0b490c262b7a…

MALICIOUS

PDF

53.0 KB Created: 2020-09-17 03:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a78c4b845801ae67ca892b5f11209501 SHA-1: 2f7a144cd70838dcc02f009d56639c045cbd1226 SHA-256: 743e0b490c262b7a6e1efd13db1650148a8aaf8adc2416fdf2309b651d3e1464
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, a common tactic for SEO link farms and potentially for distributing malicious content. One of the embedded URLs, 'https://ttraff.link/wix?keyword=mongoose+xr250+21+speed', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a reference to the malicious URL, suggesting an attempt to lure users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=mongoose+xr250+21+speed
    • http://files.carlysullensphotography.com/uploads/1/3/0/8/130814169/gubalelulufinovijek.pdf
    • http://files.earlyunitedstatescoins.com/uploads/1/3/1/1/131163615/8b5b49a.pdf
    • http://files.frederickwysocki.com/uploads/1/3/1/1/131164204/vixomowiganasag-zolike-taxigavovaxepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/math_worksheet_for_kindergarten_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/37565773104.pdf
    • https://cdn.shopify.com/s/files/1/0428/6326/3910/files/dji_phantom_4_pro_parts_diagram.pdf
    • https://15ea2e35-865f-49f4-aa10-81f3297e61a1.filesusr.com/ugd/ca32a8_430a8039738c485f9bf67cfe1389e680.pdf?index=true
    • https://e1dc7463-d345-47cd-867b-31d2f59f82ca.filesusr.com/ugd/d775a9_8bb8390e0ecf44bab76646cfdf2de58a.pdf?index=true
    • https://21659951-850a-4b9a-a004-48adc5870e35.filesusr.com/ugd/baef12_375ccfd901344adfb65237e3eba7fea8.pdf?index=true
    • https://5ffb6f4d-4c62-443e-8dc0-e0866ed75cfa.filesusr.com/ugd/957eb4_00e5715e433e4f97a99aaeaa87ef90d2.pdf?index=true
    • https://55ddb4b9-3572-4468-9e7e-752db951b2f7.filesusr.com/ugd/0ebc1f_841647c76f894dce86e7aea349fd3e9a.pdf?index=true
    • https://80ff6853-2d13-4cf6-aeb6-96f5e3777ba8.filesusr.com/ugd/9c0842_d39f7d60a6d94bab8502adfa9ab8072d.pdf?index=true
    • https://4ae9076e-a445-4741-9c85-55a73024a4fe.filesusr.com/ugd/5b9a87_a07876f6219b49a49bea79def1016a8b.pdf?index=true
    • 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_off00008f06.bin
5a15aa4cc9690479da85d16c48e477ce9fca2ff05591dc5801605a84c625d866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F06 5408 bytes
font_01_sfnt_off0000a19d.bin
92db0163d7c16cedd579a32fcb7d200cc9e71d10ecb9d27d5002bdc019855607		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19D 11044 bytes

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