Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e6972b6aa5bd5d…

MALICIOUS

PDF

34.7 KB Created: 2020-08-30 19:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a8122d808bd837dc85393f0c7ee394 SHA-1: ef7fb560f83897caecb65c1dea9e0aec4a797c4a SHA-256: b0e6972b6aa5bd5d0866094ad2b711da5bb3cb08abf7105c67d89e9a8353130e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical link to a known malicious redirector at https://ttraff.club/wix?keyword=coloring+books+printable+free. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect users to malicious infrastructure. 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.club/wix?keyword=coloring+books+printable+free
    • https://static.usrfiles.com/ugd/9b5f63_b33160bf6eae436c821d46e3fa0145e9.pdf
    • https://static.usrfiles.com/ugd/516793_218a28477aa542b0b2aec8e3f5c01769.pdf
    • https://static.usrfiles.com/ugd/b8c837_d57a875f48484ecb9c7ba2770793a251.pdf
    • https://static.usrfiles.com/ugd/2274a7_671ad0b14bbb46deb78b5b7fd7affbd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_79cc6e811873480ca61b1ff00357a0c7.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/kiwezenijufuwuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/1486/5575/files/adivasi_video_song_wapwon.pdf
    • https://cdn.shopify.com/s/files/1/0437/1726/3510/files/dinijinibir.pdf
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/tojeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/saxodujenidubizixude.pdf
    • https://cdn.shopify.com/s/files/1/0436/1197/9939/files/bafg_berlin_formblatt_8.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8357/files/emathinstruction_algebra_2_unit_13_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/baptism_certificate_template_fillable.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_off00004aee.bin
2d8a431ba7a87271221d1979f5436bf8540e6721d27075bab8107ed54d89e217
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEE 5180 bytes
font_01_sfnt_off00005c94.bin
4bf38e5d65d870f6f4cdab99063748a8820391b56ae456859c742d8338666f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C94 9836 bytes