Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43457fe4b1cc608…

MALICIOUS

PDF

54.0 KB Created: 2020-08-31 03:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1947af00d69eaf6a76cecebc9c681960 SHA-1: cc092b6dd404e3aafe50a554f69aa1064e7b86ae SHA-256: f43457fe4b1cc60853863e68028e654dd00684481aaee6008a2b4f520c858e0d
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded external links, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, https://ttraff.cc/wix?keyword=tatl%25C4%25B1+bela+pdf, is identified as a known malicious redirector. The document's body text is heavily obfuscated and appears to be mostly binary data, making it difficult to ascertain a specific lure.

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/wix?keyword=tatl%25C4%25B1+bela+pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/landing_page_with_form_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/92242420099.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/archangel_s_war_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/87643244018.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/56291775985.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/rifejamorokikudog.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/68055023389.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/wobulivudodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/26183380505.pdf
    • https://static.usrfiles.com/ugd/bd5c68_32c5f4f4193a4eeeafd77bd4e40b4102.pdf
    • https://static.usrfiles.com/ugd/b8c837_89a4ea3ff8a14ee09f582ce94b139d16.pdf
    • https://static.usrfiles.com/ugd/c0b427_25046999c6b74ffcad1c81caad624e08.pdf
    • https://cdn.shopify.com/s/files/1/0431/7390/4545/files/50913292285.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/bewax.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_off000094da.bin
a192a038364e1ada18f7b3f532cc24f5234915bca1c752dce9b39c9a878c5ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x94DA 4880 bytes
font_01_sfnt_off0000a589.bin
3de1b5b6ab0b824c606512e8c921b2085290b3935932690da3b9a7c94655ec3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA589 11676 bytes