Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbd356f1f44a3b5…

MALICIOUS

PDF

33.7 KB Created: 2020-09-01 06:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d5d66f1f8fdf165394d6157ba52499 SHA-1: d665d05be126c3a5f64024934e159fcfd264a964 SHA-256: dbbd356f1f44a3b5f00337c2a31fabd528019d232a137106af5c989302b4f84f
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as an '8th grade comparative adjectives worksheet' that redirects to a known malicious domain (ttraff.cc). The document also contains a large number of embedded links, many of which point to PDFs hosted on cdn.shopify.com and static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier 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=comparative+adjectives+worksheet+8th+grade
    • https://static.usrfiles.com/ugd/74a852_5f1359aef67e4dc5833e53cf849a9975.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecdd369a514c4b62820ed775c77ba857.pdf
    • https://static.usrfiles.com/ugd/b8c837_de519511f77a4c08a3ccf7fc9737d993.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/61568855873.pdf
    • https://cdn.shopify.com/s/files/1/0432/7781/1867/files/bawazurulidivilupibabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/children_s_catechism.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9303/files/wapolonibizezipuga.pdf
    • https://cdn.shopify.com/s/files/1/0438/8736/2216/files/exemple_d_avant_propos_de_mmoire.pdf
    • https://static.usrfiles.com/ugd/71fd01_6291f88f81024787a649961dafa7f35e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9111885aa33d4c6ead162a81e014f658.pdf
    • https://static.usrfiles.com/ugd/b8c837_35eddabeec164694aa16ed90af27fc0c.pdf
    • https://static.usrfiles.com/ugd/89c6ad_3a2cd9855bef45ef9603968ba5935c29.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/vuwosuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2199/9003/files/92311546839.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/magofaxeroxodosiweber.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9054/files/98205027629.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_off00004713.bin
9f06bb496a843c09ce10405167106aee9d4b85c8b2d71c85f38d8419955c3724
pdf-font-stream PDF embedded font (sfnt) at offset 0x4713 5844 bytes
font_01_sfnt_off00005ae7.bin
521baeeba6f42c5b591407374edf860654e99f49f02eedbda337ae6403616085
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE7 9172 bytes