Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0fafaaf07639c3…

MALICIOUS

PDF

40.1 KB Created: 2020-08-14 16:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b19719a4de97df5b273e19dce28b54 SHA-1: b384c2c65f2160ffac85cd4728398471341a2528 SHA-256: 2b0fafaaf07639c3a6cb1484fe08c36af18e7f1009abc14c308c1cbba7667fb5
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=free+alternative+android+app+store', is designed to trick users into downloading potentially unwanted applications by masquerading as a free app store. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links supports a link-farming or redirection-based attack pattern.

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.cc/pify?keyword=free+alternative+android+app+store
    • http://mizovas.sweetworldtravels.com/uploads/1/3/0/7/130738870/7936223.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/fufewaninaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/pafolizirogumaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/nefimalatul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/pinexaderebatolegife.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/56269988853.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/72872955840.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/gafirar.pdf
    • https://cdn.shopify.com/s/files/1/0447/5843/3943/files/oxford_phonics_world_4_wb.pdf
    • https://cdn.shopify.com/s/files/1/0435/6987/3054/files/valores_morales_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9688/1814/files/71330932005.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_off00006146.bin
7eee861605f013bc6c170cced10601a9b9aa2506482910ff8c654c54888cd8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 4968 bytes
font_01_sfnt_off00007235.bin
150a99bbc76329fbcd35494e1fd61ec4fbb08bcc4d565a4bd68a3f0a7c81c776
pdf-font-stream PDF embedded font (sfnt) at offset 0x7235 9860 bytes