Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f27e4ba45fc6d2…

MALICIOUS

PDF

36.2 KB Created: 2020-09-01 19:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c82670c1ba21b770f57b5b2aada68b00 SHA-1: 05a076884dcb8f1b6dbe103a3eba920819c9c394 SHA-256: 75f27e4ba45fc6d2978ea9a3bb5b366f7f5ffe3723e19cfb89793bd05585c962
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF contains a large number of embedded links, with one critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identifies it as a PDF link farm. The ML classifier also flagged this PDF as malicious with high confidence. The primary malicious IOC is the ttraff.com URL, which is likely used to redirect users to further malicious content.

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.com/wix?keyword=balkar+ankhila+balori+akh+song
    • https://cdn.shopify.com/s/files/1/0437/1329/8581/files/9824458568.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/android_webview_load_from_assets.pdf
    • https://cdn.shopify.com/s/files/1/0437/5012/9813/files/vekoxivenade.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/zavuzivawufekemopusani.pdf
    • https://static.usrfiles.com/ugd/b8c837_82215c7f92a84d68842c521fdb60dc0b.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/22111226691.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/electronics_letters_word_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/28638353179.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/bannari_amman_devotional_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/early_renaissance_art.pdf
    • https://static.usrfiles.com/ugd/edb4a7_4e59efadd89a4d9982634585889d3136.pdf
    • https://static.usrfiles.com/ugd/cfa91a_50d4725d9078497ba9d022209e94e876.pdf
    • https://static.usrfiles.com/ugd/440e29_76a231b380b048b091c32798332275a4.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_off00004af0.bin
7391eccf3b4b59e6f8ccf9338b7b6a0f5a9416d05f96cca39e9ebf4d0b980b2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF0 5200 bytes
font_01_sfnt_off00005c9e.bin
99f138563ac9b203086ddb41534cd1b1b60fcec5099d27b8451fa993710076c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9E 12340 bytes