Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b44dc9b14b0c75…

MALICIOUS

PDF

67.6 KB Created: 2020-09-06 13:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cea27153b68fb77dcbf3e028c77b732 SHA-1: 70d4712864d56ab95e77a12822c97571d0b33754 SHA-256: b4b44dc9b14b0c7514b161fa1bc4bd17c0c751ae31783831856ad3dc16e459dc
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised with a seemingly innocuous keyword. The document body, though heavily obfuscated, contains the same URL. This indicates a phishing attempt to lure users to a malicious site. The presence of numerous external links also suggests a link farm or SEO poisoning tactic.

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=current+breastfeeding+guidelines+uk
    • https://static.usrfiles.com/ugd/902d29_e7fd1927386441ed9133abec34875cd0.pdf
    • https://static.usrfiles.com/ugd/96564c_3c7dcc5b02994b658dddc9e2ddfed3c0.pdf
    • https://static.usrfiles.com/ugd/934fc3_d3c245d68cbf4d3a8f9c0e65710f38ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_72bc68036a1642ee9758299c485872fe.pdf
    • https://static.usrfiles.com/ugd/cfa91a_16c6f8781d8047fe8419da4fcc9906df.pdf
    • https://static.usrfiles.com/ugd/8c7d07_bb037a56773148f3a6a90163faa17e11.pdf
    • https://static.usrfiles.com/ugd/a2e20a_7df8ba22155c44ac91f35598cda132fa.pdf
    • https://static.usrfiles.com/ugd/defd8a_0385d93a0035466f841f2ec24e671d9b.pdf
    • https://static.usrfiles.com/ugd/c6ac46_a71b922a2ef64b3e91960ead7861e9c8.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0326/files/wps_to_word_converter_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/96193981089.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/29331600007.pdf
    • https://cdn.shopify.com/s/files/1/0465/2243/3686/files/83328238013.pdf
    • https://cdn.shopify.com/s/files/1/0457/6110/1980/files/gallstone_guideline.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/airplane_2_movie_free.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_off0000ca60.bin
53ba91f7946baaeb1799653f391c54eb13f0ef314785e86113d67a80c5175244
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 5184 bytes
font_01_sfnt_off0000dc0e.bin
b2abdc6f492b3d46fca90be10ac7bdfb3ccfe2f72c51c0dbc0dace1eefd990db
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 10864 bytes