Malicious PDF — malware analysis report

Static analysis result for SHA-256 9935dc3649cab794…

MALICIOUS

PDF

45.8 KB Created: 2020-08-10 13:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6ed3a94391162f23814a18156d199e6 SHA-1: 7fc9c8300c1f8c7172f9ea24b1a4a937da883c4c SHA-256: 9935dc3649cab794f460237400d91f88cbcaa6b9d4656d9da4345690ddec6914
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. This suggests the PDF is designed to trick users into clicking malicious links, likely leading to further malware downloads or phishing pages. No scripts were extracted from this sample.

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/pify?keyword=specific+gravity+test+of+aggregate+pdf
    • http://files.bekersmct.co.nz/uploads/1/3/1/6/131637072/f2825884a65fe2.pdf
    • http://files.etcheer.com/uploads/1/3/0/7/130775786/sifetulilajenol.pdf
    • http://files.lwbranding.com/uploads/1/3/0/9/130969182/bijerabuze.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2374/files/73361364150.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/fagapaxodaziba.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/51697921734.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/88479244489.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/nuxexuxarodosisolimezeri.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5512/files/gevejavobozukinidalo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/how_to_push_files_to_github.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/getezugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/comment_apprendre_a_lire.pdf
    • https://cdn.shopify.com/s/files/1/0431/0243/7527/files/balochistan_board_matric_result_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8407/files/9026115418.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/sports_competition_anxiety_test.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_off00007395.bin
69eaf231a1b6f8b15d0574f53323d3367cb66775a2a43f2c9c5820e4c16cfd4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7395 5556 bytes
font_01_sfnt_off0000869d.bin
f8af865ad6458e8f4770250499c43bd4485523618d2768464b7ae55cc318e513
pdf-font-stream PDF embedded font (sfnt) at offset 0x869D 10392 bytes