Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3555efce5c8c7e5…

MALICIOUS

PDF

83.8 KB Created: 2020-08-05 10:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff2f90d65001ba272ca03303ab0ba65 SHA-1: 178621fea6cd4e3da7a3dfb5394e4bc2bda13b11 SHA-256: f3555efce5c8c7e55c476312b0b8f703d91a67d05ef98722cb1fd4669422dde6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=hallelujah+lyrics+pdf, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=hallelujah+lyrics+pdf
    • http://files.veteranshealthfoundation.com/uploads/1/3/1/4/131484133/jetoxewofap.pdf
    • http://files.krmcloughlin.com/uploads/1/3/0/8/130814208/4774096.pdf
    • http://files.darlingyoga.com/uploads/1/3/1/3/131398406/xekigotam.pdf
    • http://files.apieceofthesky.net/uploads/1/3/1/3/131379325/1628018.pdf
    • http://files.moirsa.org/uploads/1/3/2/6/132681910/vinafemozire-juwaraki-fosirusimob.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/71813184125.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/flash_powder_classic_wow.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/63124215432.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/58430083455.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/kupukew.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/latob.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0528/files/giberoxogoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/98082237470.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/nagagolonemomunisuzar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/libipadekikiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/80863359824.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_off0000ff0a.bin
771fc81e997d25a4651dd917f14e5ac7739b1230ec42a7de297f9c52499765e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 5380 bytes
font_01_sfnt_off0001115d.bin
ee56779f057a127a161ddb6caccba4cc311c4ce7eda5b1d75bfc8a18749bb865
pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 15984 bytes