Malicious PDF — malware analysis report

Static analysis result for SHA-256 556a08a8481f719b…

MALICIOUS

PDF

41.5 KB Created: 2020-09-02 07:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f632d543854076125bc0efd32f59012e SHA-1: f8c7ec4232256d54b0ba4c88ef16145831cc9bfe SHA-256: 556a08a8481f719b4ddae97083b6fcb1a3de05a99007cb18492e7ea61a76a2ad
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic indicates these links point to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=worksheet+6.+16+future+tense+spanish`. Another heuristic identified a large PDF link farm, with the first URL being `https://cdn.shopify.com/s/files/1/0438/0341/0589/files/conduction_heat_transfer_arpaci.pdf`. The document body contains garbled text but includes the same redirector URL and several Shopify URLs, suggesting a lure to obscure malicious content.

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=worksheet+6.+16+future+tense+spanish
    • https://cdn.shopify.com/s/files/1/0438/0341/0589/files/conduction_heat_transfer_arpaci.pdf
    • https://cdn.shopify.com/s/files/1/0433/6517/1354/files/98903073684.pdf
    • https://cdn.shopify.com/s/files/1/0438/5731/3957/files/lego_batman_red_brick_locations.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/19982138695.pdf
    • https://cdn.shopify.com/s/files/1/0437/5819/0743/files/sukewodefirefezaropom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/kuvobukijonebebarav.pdf
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/mortal_kombat_cheats_sega.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/ielts_reading_academic_practice_test.pdf
    • https://static.usrfiles.com/ugd/de3d83_c61265f90e0249389d981f8072dd0fd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_86aeb39a92184ebe99ba87586b5a36cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0045a5acf644ecd8e81c7dd61163492.pdf
    • https://static.usrfiles.com/ugd/374ce0_23da2cd7b5d940299e7eeed5ab65994e.pdf
    • https://static.usrfiles.com/ugd/1849a1_d13c9121fabf4b30a17cb41805485e6a.pdf
    • https://static.usrfiles.com/ugd/5a1791_87ab0c3f8c124d49b2a86bf1f119ddc6.pdf
    • https://static.usrfiles.com/ugd/94e5ef_96fc398ca52249bcbd9719ecb307a68a.pdf
    • https://static.usrfiles.com/ugd/269bb8_4ff7d3dd447246ffbb02b51a2bbc9dbb.pdf
    • https://static.usrfiles.com/ugd/12f4eb_79cbf89910854a43918aad927d4ee65c.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_off000058f8.bin
6a9e9aac9724c232386c3c1c2f52579b0104d923872185fea620300de3dd64e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F8 5272 bytes
font_01_sfnt_off00006afb.bin
a0c4972d259b7b616dbe602d58e90aa077a8f3031492c2e63e1b3be83a30b9a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 14128 bytes

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