Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1003e91695fc1a…

MALICIOUS

PDF

44.5 KB Created: 2020-08-29 12:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12c1b1395bbf07c575af860355480713 SHA-1: 820b1587f8ee42e309f2c36200fc7b4c941979b8 SHA-256: 2b1003e91695fc1a6185fd9b73cbe35f56119cf1babb93adb6bd87bf6c827857
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=100s+chart+games'. The presence of a link farm with 30 PDF links, many hosted on shopify.com and static.usrfiles.com, suggests a tactic to artificially inflate search engine rankings or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=100s+chart+games
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/volume_of_a_solid_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/bronchitis_akut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/gipomukunuzotuzalemolula.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/80704321553.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6953/files/498716470.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d40a386dc844cdb4fc434921724c2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e6c33583d0149a1b0a00f7e04f99994.pdf
    • https://static.usrfiles.com/ugd/b8c837_423d986f863c48a18d208a4cfaab8dfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_b61eece07ac84e12a16fc3fc155c8555.pdf
    • https://static.usrfiles.com/ugd/b8c837_b78163a9bbf3495c8c4378ef908fa1d9.pdf
    • https://static.usrfiles.com/ugd/4b874d_0fdffee67e7b4d59adff49fb7f6e2748.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3954f0b56d548478077c4952f816435.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4e7399ef10f49729aac82d6bcbcfe2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_73d299d862fd4e2e9863d1280a5e008d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ca48d9cf1ea42d6b622902e88f03f13.pdf
    • https://static.usrfiles.com/ugd/b8c837_4887ac9c92e94fc5863722ec49a8ce1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bce31467cbd47ea8981f461cbed9cf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a8b07f1bdc742179441e9bc251b0cc7.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_off00006f64.bin
ff5f824667c4d849342f243d283b47646ee254de9953413ee640ce8b3b5cbbe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 5280 bytes
font_01_sfnt_off0000812f.bin
6fd24ce2f207a5cd387163ff4eb489b0800403158a66e6b29590e3f3398b254c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812F 10744 bytes

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