Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62f789688dd3fba…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 04:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72003fb7927fef5069316ee31acecf5 SHA-1: 00455c98f7a1daddf1af987218cffa3fe39d6268 SHA-256: c62f789688dd3fba8cb78221da714f35ebb91ed04bff759c606826bc8f05ef8a
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free workshop manual download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the lure text and the malicious URL.

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/wix?keyword=vauxhall+astra+j+workshop+manual+free+download
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/23293488533.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/50790887006.pdf
    • https://cdn.shopify.com/s/files/1/0439/2937/0779/files/desinimo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/nibaka.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a0b6046ad114dd39fdaab408f25ea4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_edf34281e076497fa78759fc38a0a2a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_df138d8e91464135ba6ad496f8f6ca03.pdf
    • https://static.usrfiles.com/ugd/49be48_e4a9d417c6df40a8b2ed14dfe92c2305.pdf
    • https://static.usrfiles.com/ugd/51c472_3de25d1a8bb54abca9da2971e210006e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f59dcc6f09e496f9b992b449d9a0371.pdf
    • https://static.usrfiles.com/ugd/a640e9_93c0d026e5854fd2b4e4bff039da6f91.pdf
    • https://static.usrfiles.com/ugd/111c46_c2e572db09fb4e8ca41616cb72b8271f.pdf
    • https://static.usrfiles.com/ugd/b8c837_782299235530450c9058303eeaf824af.pdf
    • https://static.usrfiles.com/ugd/b8c837_895bc1339dad4deebd748217b346c316.pdf
    • https://static.usrfiles.com/ugd/628a76_d8acb548e25041c1906a0ae052b1fdd9.pdf
    • https://static.usrfiles.com/ugd/bb13a2_ff052e7b969e4b84902c108bdc9c7523.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_off0000600d.bin
3f251c53bdb6d79cedf50ca62da24083da6856473f2af82d972dc0accf10b01b
pdf-font-stream PDF embedded font (sfnt) at offset 0x600D 5544 bytes
font_01_sfnt_off000072e6.bin
f711ebb61387ee1f6493981f2438ae2604ae35bf0cf37756395026a0dc1defad
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E6 10436 bytes