Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc8ec519abb44c7…

MALICIOUS

PDF

45.8 KB Created: 2020-08-29 04:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13920dfed24359bfcb8506722b72bb15 SHA-1: f5bc8c592a800b641dd4d6c453b411acbc2d60cb SHA-256: 8dc8ec519abb44c731add1ce739dbd6a2226d0f61fb7689a25eb7c19008d983e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a VMware download. It also features a large number of links to other PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to determine the attack pattern.

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/wix?keyword=vmware+workstation+9+download
    • https://static.usrfiles.com/ugd/b8c837_0178780341434a749fb36962dd2e172c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf320dace5ef4899b94c0e7b89ca9479.pdf
    • https://static.usrfiles.com/ugd/b8c837_61bad3644f934a5d853a47703719c7e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d39e2a1635f048eca7c97ccc15301fde.pdf
    • https://static.usrfiles.com/ugd/b8c837_f167e14e2d9146d89997c6dec38086bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f878df0ea8b4a448d5abcb9aa01e1cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa9ca426d15349f3a5bc093628f85eeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_59fa1813d14a48b384a6d51b8831d1e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e0003f6df384570a96f39d9c6e2e33e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8bb3b6efe8d4c31b864064d81324398.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/pegipepinomejibo.pdf
    • https://cdn.shopify.com/s/files/1/0462/5183/5543/files/tajufosu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/area_of_composite_shapes_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/7704232422.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/fuxosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/biliwakatutiwobugageral.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/paluno.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/24760747978.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_off000075a6.bin
783cbbf4de596ced1eef7a5f7dbbcdd2a26935a4b7c996c50f7b571cf60bc90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 5248 bytes
font_01_sfnt_off00008774.bin
f44a5cb842a65e5781d210ed1a15cf5ecb08ca81fcfdaf404db254982bd9fd04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8774 10296 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.