Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc66a75ccf0359f7…

MALICIOUS

PDF

86.9 KB Created: 2020-08-22 02:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 295af663162ebd060d9801cd320c67d4 SHA-1: d02a9a5e2bee95b7bdd5f45472721dd6d532fdc9 SHA-256: fc66a75ccf0359f703a498b6b3f019fa15324f4c92c64e0721a61ebe0747765c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL that the heuristic flagged. This suggests the document's primary purpose is to trick the user into visiting a malicious website via the embedded 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.ru/pify?keyword=calculus+derivatives+pdf
    • http://files.myapplepodcast.com/uploads/1/3/0/9/130969220/gusatesawudidizedapo.pdf
    • http://bepel.positivescanning.com/uploads/1/3/0/7/130775897/vafonobo_wusuwesado_xesar_dubaziz.pdf
    • http://sagamaz.throwinabird.com/uploads/1/3/1/4/131407178/zadogafowax-kakoriliwumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/applications_of_bioplastics.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/sajajotitunuxekurovelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/aluminum_hydroxide_msds.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3533/files/enhancement_shaman_pvp_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/lobepolegifalur.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/padowufe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/nugobaditaxedokufikonisi.pdf
    • https://cdn.shopify.com/s/files/1/0439/9765/9294/files/cisco_cyber_ops_210_250.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/52671732107.pdf
    • https://cdn.shopify.com/s/files/1/0432/6686/7362/files/sql_server_2020_alwayson_availability_groups_step_by_step.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_off0000f2ec.bin
297608fcfef678fb9c4c1371f0ed134950f7f885f57b9b68d146d5197607476f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 5116 bytes
font_01_sfnt_off00010461.bin
a2bfb07f990aa46369b685911bb5523bcada26c8064673377411f8c411aedd5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 16684 bytes
font_02_sfnt_off00013810.bin
e874dd008176a235ae01f2a09c98f2a20da8a110711184d588c1f82d0955f209
pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 16400 bytes