Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5135ca6bd76e4b9…

MALICIOUS

PDF

43.1 KB Created: 2020-08-21 13:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b7144bb1f541c74cc26e7d198fbb50 SHA-1: 6cce0022fd031304b9669b38bfac2b975c21fe63 SHA-256: c5135ca6bd76e4b96cc8250928091d7813b96685bce01d9499f924a71b41b71e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains the same lure text and URLs, indicating a phishing attempt disguised as content related to free TV series apps. The ML classifier strongly supports the malicious nature of this PDF.

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=tv+series++app+free
    • http://gumazaze.womenofwpg.com/uploads/1/3/1/8/131871453/29ebd6c.pdf
    • http://files.theavocadocupboard.com/uploads/1/3/1/8/131856039/sepolam.pdf
    • http://files.cuicsocal.org/uploads/1/3/0/8/130814594/7502789.pdf
    • http://files.best4youmassage.com/uploads/1/3/0/8/130874361/7417747.pdf
    • http://files.shiragirlschoir.org/uploads/1/3/2/6/132681438/b19819daffed.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/10081818623.pdf
    • https://cdn.shopify.com/s/files/1/0444/3347/3703/files/35268223909.pdf
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/33052546965.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/sesukipod.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/pazobukewawodik.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/55399953455.pdf
    • https://cdn.shopify.com/s/files/1/0430/7428/9813/files/bonomusogugumog.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/fashion_catalogue_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/github_host_website.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_off00006bc1.bin
6f13ae3abe31acbc41036f414d84c3f7af4305fc0b4c2cb454ba29d995c247c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC1 4872 bytes
font_01_sfnt_off00007c6a.bin
5b089bfc73fcc6521dceb7c19276b89437354fa1167dc641e991b84482c6eaa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6A 10428 bytes