Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd4bb433b527263…

MALICIOUS

PDF

53.7 KB Created: 2020-09-02 20:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbfe245f3308f964b2bb2c60006f1d26 SHA-1: 52095e06b716632937e03cd5fe759e8228f69662 SHA-256: ffd4bb433b52726369e8b1fe564db2efa2c558b4e187c363e641911fb9393491
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=assumption+college+high+school+uniform'. This URL is likely part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. The presence of a large number of external PDF links also suggests a link farm for SEO poisoning or traffic redirection.

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.club/wix?keyword=assumption+college+high+school+uniform
    • https://static.usrfiles.com/ugd/510a18_209b92f5df214f738cf3a30db6d8f4e0.pdf
    • https://static.usrfiles.com/ugd/0f5b72_e9e2868eb3dd4fa88f98c9c5377a2d06.pdf
    • https://static.usrfiles.com/ugd/1a89c8_bcbf70e1660a4baeaf8e26d50133d71e.pdf
    • https://static.usrfiles.com/ugd/9c43ec_ca91a2ca57e04bfbbab136ffd108ab8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5e6233c05c8430a99a0aaa36d5cb547.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/48872988163.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/bubowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7991/6967/files/17146714870.pdf
    • https://cdn.shopify.com/s/files/1/0441/1149/5320/files/vuruxolosapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/abecedario_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/56431586547.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/91763694641.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008607.bin
64f1753173e075dce469c852bcc1a33c469936a90e409f500aec41a8fb633d2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8607 5092 bytes
font_01_sfnt_off0000972e.bin
cbe42261edd2df24d10768bd47382e485ea5f00bde0748da56de168411aa64ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x972E 10588 bytes
font_02_sfnt_off0000bb2e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 4324 bytes