Malicious PDF — malware analysis report

Static analysis result for SHA-256 51639be82fb5d3c7…

MALICIOUS

PDF

46.4 KB Created: 2020-08-19 12:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a0e79f2766dff6d55512332805bb583 SHA-1: 3a876df5c512db9ade198e948c08798e2eca9f3d SHA-256: 51639be82fb5d3c71bd821a829eb7543509fc7b81225265bdc14574daf2696c3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic firing identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious destination. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. No scripts were extracted, and the PDF structure itself does not indicate further exploitation beyond redirection.

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=rajasthan+librarian+question+answer
    • http://files.florablackettdesigns.com/uploads/1/3/0/8/130813762/dibusumenebagina.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/wewinalaxasaravisuxifujud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/mavukaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/5803/6889/files/posalagarusowodo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/ontology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2406/files/mafabivafeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/79978506207.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/beautiful_disaster_series_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/xegipukezifosenixazixirir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/87727425682.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/bivarapowosijefasawikoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4619/8683/files/almost_single_advaita_kala.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/addressing_modes_of_8085.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000581d.bin
fc3421750ef0b58a5079fa310575ec111f53a80b0a9c40061746c2ec0e2e0412
pdf-font-stream PDF embedded font (sfnt) at offset 0x581D 5212 bytes
font_01_sfnt_off000069e4.bin
32f7bd56dba3a707cbe42c1c8ade61f15aa811651631fb3d586c896a9b215f72
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E4 13304 bytes
font_02_sfnt_off000093cd.bin
565a6d7f41587b0c85e606b19f7706ff7f1d720767ee8a11dfdf2803fd1b1387
pdf-font-stream PDF embedded font (sfnt) at offset 0x93CD 7656 bytes