Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd8b365d92cbd71…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 10:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35420480825edcae5d4b5f1cb94f087e SHA-1: aa1697ef2bdedd6e9d8bf4c03a70c78d82d7d583 SHA-256: fbd8b365d92cbd71c7dc9e90076bdd5c079972f9cd006ff6aa20814785dc2943
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=angela+carter+the+magic+toyshop+pdf`. This link is presented within the document body, disguised as a book title, to lure users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly supports the malicious nature of this PDF.

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=angela+carter+the+magic+toyshop+pdf
    • http://files.moriahellamason.com/uploads/1/3/1/8/131871614/07d395dfb93d3.pdf
    • http://files.rozanalee.com/uploads/1/3/2/3/132303077/ropov_levorasixafiw.pdf
    • http://files.easttexasbridalfair.com/uploads/1/3/0/7/130776120/guzenukigujulet-sijise.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/43624437294.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/jadozepejefitila.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6802/files/mi40_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1746/2182/files/types_of_electrical_cables_and_wires_in.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/biocentrismo_lanza.pdf
    • https://cdn.shopify.com/s/files/1/0450/7897/0533/files/castillos_del_loira_mapa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/60299181036.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/do_you_put_periods_after_bullet_points.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/16793503697.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_off00006b93.bin
3adea9cf547dfd4458bc5bb72577a491eb8ff597ed6f907d344a0e73c4a99d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B93 5660 bytes
font_01_sfnt_off00007eb5.bin
9dbd7873f3a40514a4739e93aad355dd488b853b6117092e5ac0fb37c9e4ebf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB5 10088 bytes