Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c8922fbd892b6b…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 01:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd648f5ff310f8a2a17a3031ef69a9b5 SHA-1: 77490d52e846e55a00a7adee9a31d2afa18a7d9d SHA-256: d7c8922fbd892b6b9db9dc3c49789dc131ee13c67623475a547597d7e2f2769a
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, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to dating advice, and the malicious URL is also present in the document body. This suggests a social engineering attack designed to lead users to malicious infrastructure.

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=get+an+ugly+girl+to+marry+you
    • https://cdn.shopify.com/s/files/1/0434/6026/4096/files/3rd_person_singular_present_tense.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/xeberatuzatebaledujifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/21283297974.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/polar_coordinates.pdf
    • https://static.usrfiles.com/ugd/b8c837_54747d7996d7449ebdc7dc3d22e5f778.pdf
    • https://static.usrfiles.com/ugd/99965f_c8b57025e0634445b780fd22f3be34c2.pdf
    • https://static.usrfiles.com/ugd/db1da1_c94dad4173f14a70a1abf0eafdadbde1.pdf
    • https://static.usrfiles.com/ugd/b80405_d0341f64497f429683850ffaba321bfe.pdf
    • https://static.usrfiles.com/ugd/83f04e_eb569306bd7c4e65b9d00464ef23925d.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3773/files/atoms_molecules_and_ions_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1463/5171/files/podubuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/mewizofizolimipew.pdf
    • https://cdn.shopify.com/s/files/1/0434/2448/1431/files/jatitolubebor.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/62240086332.pdf
    • https://static.usrfiles.com/ugd/ea78e0_550878a1594e47af9ba89d8e0a9fc5b3.pdf
    • https://static.usrfiles.com/ugd/bf0735_8113947c37164cbaba12369491ceeab1.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_off00005e71.bin
bcc2ce92d7e4c4ee6fe9e41e6d2184164ab3848f9b21f703363831cb16b58c66
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 4960 bytes
font_01_sfnt_off00006f4d.bin
847639a16cbf962d5e804c030f0ae2faeedb5ba71554f67a6abe43442961879c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 10916 bytes