Malicious PDF — malware analysis report

Static analysis result for SHA-256 babab5669282c5ac…

MALICIOUS

PDF

39.1 KB Created: 2020-08-29 22:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f106c82fa2da238fdaf88b415dc9aacb SHA-1: 7fd1271bd97acabf48a83358a7dd37b2af93c0c9 SHA-256: babab5669282c5ac6d8acfd25d361f5379455627e36e91a947cf428676722780
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=kettlebell+exercises+pdf, is flagged as a malicious redirector. The document body, though heavily corrupted, appears to be a lure related to 'kettlebell exercises pdf'. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to mask the malicious redirector. No scripts were extracted, and the primary malicious activity observed is the redirection to a known malicious 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/wix?keyword=kettlebell+exercises+pdf
    • https://static.usrfiles.com/ugd/e2c6c1_015b83cbd753419d9c09a0be9d276ac8.pdf
    • https://static.usrfiles.com/ugd/b8c837_46682a80216343feb2759780646ef187.pdf
    • https://static.usrfiles.com/ugd/b8c837_3812a23079d74b67bbe662700c4bc0bd.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/emerald_tablets_of_thoth_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/san_expedito_quien_es.pdf
    • https://cdn.shopify.com/s/files/1/0439/4418/1928/files/confused_anime_guy_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/6598/0581/files/72913955172.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4354/files/xinigawozesobut.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/grasshopper_mower_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_986d6d3f0bde48f389dc74c1d2969c71.pdf
    • https://static.usrfiles.com/ugd/b8c837_685f752c2e35491fab12d5c193624096.pdf
    • https://static.usrfiles.com/ugd/b8c837_f20c8a843dca4c0fb47fb30996a38280.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c52.bin
6175991e613d469943039a0f4e4fef4d9e7345656576d502129dfbceec60f334
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C52 5116 bytes
font_01_sfnt_off00006dcc.bin
af66cbd171eda865b729e3f84766dd7689d73ff3b3e5ea954a56a378fa3b77e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 10008 bytes