Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a7ae3768f15d92…

MALICIOUS

PDF

54.8 KB Created: 2020-08-01 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc72ecde532f85d40f4e3ccc553838b7 SHA-1: 75e3ad5a6309bbfd107ccc46cdcb818effee309c SHA-256: c7a7ae3768f15d92675bfb14023824f050a5443d837516c23ee71b2ec8743d8a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=operations+management+krajewski+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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/pify?keyword=operations+management+krajewski+pdf
    • http://files.timdeanesautowholesale.com/uploads/1/3/2/8/132814050/tekej.pdf
    • http://files.castleviewbands.com/uploads/1/3/0/7/130775497/3122627.pdf
    • http://files.harpsrv.com/uploads/1/3/1/6/131606866/devotavikojap-bisosi-wefuvo.pdf
    • http://files.1000cancerstories.com/uploads/1/3/1/0/131070872/sitib.pdf
    • http://files.articlewriterforhire.com/uploads/1/3/0/7/130739777/gadaxanekewepab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/51291251985.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/duxevopabuzomitimirew.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/jewipepixoremozawasip.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/guwanomedosiposapamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2335/8358/files/19805203972.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/56138132678.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/44025125240.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/14600152095.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/92819584921.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a5e.bin
3295bdda94c98eaf88aeb6eaab8f56889c136cbc6829a0027443d00c2bcbcccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5E 5376 bytes
font_01_sfnt_off00009c9f.bin
85ed761afae5ad59289cd0b4597c718462f08e76f29c4a00840f4e7ea4fa94a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9F 10240 bytes
font_02_sfnt_off0000bf6e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 4324 bytes

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