Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1941b3074c7cb9…

MALICIOUS

PDF

109.3 KB Created: 2020-07-31 22:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1633b14ff0dd734f9f389f286098a1de SHA-1: c93151b0a377c6e23055d2f71c21abd78b68079c SHA-256: 6c1941b3074c7cb96501343ec90b0e0bba603a4b0f6038f71624ca64b83745c9
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating it's a redirector link to a malicious domain. Another critical heuristic identified it as a PDF link farm, likely for SEO manipulation. The presence of a malicious URL and the sheer volume of links suggest an attempt to lure users to potentially harmful content or to manipulate search engine rankings.

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=cap+of+water+breathing
    • http://files.negsbestthing.com/uploads/1/3/2/8/132815961/riwemuto.pdf
    • http://files.preppedandprimped.com/uploads/1/3/0/8/130814070/kuwinomu-fixudapumujak.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/0/7/130739769/wapuwivegub.pdf
    • http://files.exelevent.com/uploads/1/3/2/7/132712325/4952997.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/ropuvazesepevewoxegidexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/13907893545.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/modipejajik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/52649847602.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/zujovowowejomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/kajuwadelesozapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/zakopepajujaxopimitagod.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/zoturunakerokonegaxefoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/76169785806.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/lijupisofeluguko.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_off000171fd.bin
0d202815f4c5310873055d08cbc4570d17f94d8d2a6343f397a6357d3831c856
pdf-font-stream PDF embedded font (sfnt) at offset 0x171FD 5088 bytes
font_01_sfnt_off0001835e.bin
18aebd14cf62b8c7bc78c163749bb440ce9a106a0c9ce19823e3dff7b86bd20d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1835E 10848 bytes