Malicious PDF — malware analysis report

Static analysis result for SHA-256 1237e3d29f49dc2c…

MALICIOUS

PDF

34.0 KB Created: 2020-08-31 09:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0eb1e3a80a50afbb159d710f34da46f SHA-1: d3b3b5474fa325f4fa5e91c5748f59d472c78e90 SHA-256: 1237e3d29f49dc2c2586d69b659cd3708dd4c2cd307867144a1b338546347dc5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, one of which points to a suspicious URL. The document body, though heavily obfuscated, contains the same suspicious URL and other benign-looking Shopify URLs, suggesting a lure to external content.

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/wix?keyword=savarese+omt+pdf+reddit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/davidekiwofijini.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/34481351523.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/pugiwodezosaxoxodu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3098/5376/files/nabodawat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0752/files/bully_apk_and_obb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/film_a_critical_introduction_3rd_edi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/23085053051.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/38969340942.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/82696788974.pdf
    • https://cdn.shopify.com/s/files/1/0435/7321/5387/files/10334025435.pdf
    • https://static.usrfiles.com/ugd/b8c837_64868b7e3afa4005ab0bfa9053173533.pdf
    • https://static.usrfiles.com/ugd/77941b_1a062cc19825496f8964155eaab17fb9.pdf
    • https://static.usrfiles.com/ugd/217d68_b95a09de58164a149a0d7f1b3fffd469.pdf
    • https://static.usrfiles.com/ugd/e3834b_a898042f1174441da4b3316ebefbf5d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_8802e6d6dfc24d6abd5ed5a757618d64.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_off000046cb.bin
bb39b736480778230379b44fc6bcf755f4bd84e9ba6bf31968a193257663407f
pdf-font-stream PDF embedded font (sfnt) at offset 0x46CB 5320 bytes
font_01_sfnt_off000058cb.bin
95bab5f54ce36fbc7334fb012e67c6ad564023f1f08978e7e49cb0974ac0466b
pdf-font-stream PDF embedded font (sfnt) at offset 0x58CB 10096 bytes