Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ff417b59584528…

MALICIOUS

PDF

41.4 KB Created: 2020-08-28 02:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f328cf69de4b225fc1a86276cb2468a5 SHA-1: 2e3a3cb3437804c9a7b7ef48e7431558a93787a0 SHA-256: d9ff417b595845285cabce558b278799e6f9fabc065643ba68f2726d22e78c8c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to lure users into clicking on the disguised book title. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/pify?keyword=forensic+and+legal+psychology+3rd+edition
    • http://files.kitchengarten.net/uploads/1/3/1/6/131636903/2877505.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17810153535.pdf
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/pimasobetuvobojeruraz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/vatosubipofugezew.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/valivuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/resuwibeluma.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5598/files/1967187603.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/18257206214.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/materuvav.pdf
    • https://cdn.shopify.com/s/files/1/0440/0293/4942/files/tujolokobubudijex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4511/files/megabox_hd_can_t_play_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/1057/9865/files/dekiwunubofimedowaluwavek.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/nomotanijeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/farberware_percolator_12_cup_manual.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_off000063d0.bin
e5128c57e6beca56e761ccb5c334be6217eb5b48d6c3d4f30d9e7bc0b21a6747
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 5556 bytes
font_01_sfnt_off000076ab.bin
68aac12322cc19e27c4c4477915b569e075e5d41ff22c15a584791ce844169ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AB 9932 bytes