Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a219b03714fbcb…

MALICIOUS

PDF

45.2 KB Created: 2020-07-29 15:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f27242ca9540ebf9bff05b881bb8ba7b SHA-1: f675b43e6f845806598b23bfc097596f91ed1cec SHA-256: 57a219b03714fbcbc3234666ec179968df8455deae444b53cd5defc645b6f85f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'ttraff.com'. Another heuristic indicates a large number of external PDF links, suggesting a link farm designed to obscure malicious intent. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious sites via deceptive links.

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=formalist+theory+in+literature+pdf
    • http://files.apieceofthesky.net/uploads/1/3/1/3/131379325/1628018.pdf
    • http://files.sciencealivefl.org/uploads/1/3/2/8/132814400/dd5749d.pdf
    • http://files.graceceremonies.com/uploads/1/3/1/3/131379054/42986.pdf
    • https://cdn.shopify.c
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/60835363329.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/rigevipaduva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/29167345952.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/82922574626.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/74673367356.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/pawubojuzexapukeduvala.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0391/files/sidagepiverajefevuzemar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/xisofejolevulapejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/redefujijiduwolegepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21883700101.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/39851599923.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.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_off000073c2.bin
a3eba3b8ed4ac9db8310d2322bac967a152a7b3c66c6cdbdbdcc980d0228261e
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C2 5220 bytes
font_01_sfnt_off00008557.bin
8dcc08a89cf6121003bd02907f344fa6c0104a8861a596e5da209c93a4b81dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8557 9984 bytes