Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd013b1ace30773…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 03:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd1a2dc7f034b5299f20e41d3ff42010 SHA-1: c5c32e33fe928ec1c7d7356520078e28e01f14cb SHA-256: ccd013b1ace3077338e8d06600d58dbd5212e5abfc14009af1cca4ff5ea03bf4
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used to create link farms. One of these links, 'https://ttraff.ru/wix?keyword=modoex+tablet+review', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

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=modoex+tablet+review
    • https://static.usrfiles.com/ugd/9e14ca_ce1784b0af5e473f8db0063cb3221866.pdf
    • https://static.usrfiles.com/ugd/bb13a2_78346b38c5c645dda6fbcce525603288.pdf
    • https://static.usrfiles.com/ugd/b8c837_893a195d1b2a4199a32a068ba87ce632.pdf
    • https://static.usrfiles.com/ugd/ae15ca_fb2609de1fd247a39e614c624608aba7.pdf
    • https://static.usrfiles.com/ugd/11f207_5477188fb06b483d9edd0bc639743000.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb29977c52a348d393c4cc9969d8b762.pdf
    • https://static.usrfiles.com/ugd/20d83a_e3fd406a51c04b2a8eb4a40c357b2798.pdf
    • https://static.usrfiles.com/ugd/b7306e_c79ab43607714226863a89e8471ec375.pdf
    • https://static.usrfiles.com/ugd/a382ee_83287fce6b4d49129c26755225b851cf.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_28ba705d1ab54fb882b49f04e0a37a46.pdf
    • https://static.usrfiles.com/ugd/49be48_865c010db38c4ad18a03c1b9dadb2848.pdf
    • https://static.usrfiles.com/ugd/d54300_7f7d01ecd8d9414eaf1481a6b67c9763.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/nefajevunesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/72296914802.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/totupap.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/simple_present_tense_exercises_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_off00006edb.bin
ce3b7a0730d526268541f0b221965cfe9b1c7f40765b4fef258ec0194f89a41a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 5008 bytes
font_01_sfnt_off00008011.bin
61ab940e8bcec760da9d6fe4778a776481d5e189fc2d7df635814279257a785d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8011 10284 bytes