Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a1052492f4c1ee…

MALICIOUS

PDF

51.2 KB Created: 2020-08-29 21:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161915d2bdd84eb17cac7437d96aa7d4 SHA-1: b35c254297abaae7a3e31130c02f5017310a1bad SHA-256: 32a1052492f4c1eef7046406ef25f7a41bff8331948569627000adf1a547f195
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a domain identified as a malicious redirector. The document body, though heavily obfuscated, contains the primary malicious URL. This suggests a link farm attack designed to lure 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.ru/wix?keyword=alto+horno+partes+y+funciones
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/colinde_de_craiun.pdf
    • https://cdn.shopify.com/s/files/1/0462/5262/1973/files/mv_wanna_one_boomerang_matikiri.pdf
    • https://cdn.shopify.com/s/files/1/0437/6379/4069/files/keppel_infrastructure_trust_annual_report_2017.pdf
    • https://static.usrfiles.com/ugd/b8c837_f20e34dc86bb4b579029d044e266d776.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7b5ca34de4477683cca469eae79e17.pdf
    • https://static.usrfiles.com/ugd/b8c837_69474a4c75ad4a7082ffc3506eac9552.pdf
    • https://static.usrfiles.com/ugd/b8c837_455e295a74104e64b1b901251d27e431.pdf
    • https://static.usrfiles.com/ugd/b8c837_54e3106e17c541dea4c45aae69730945.pdf
    • https://static.usrfiles.com/ugd/b8c837_84be0dd07e9441c8ba4c6d17d03b8329.pdf
    • https://static.usrfiles.com/ugd/6846fe_26ab99272a1a4e7080ed681f2394e904.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fc75fb2f3944d28a06cd18ec474751e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6cc8d398eb548c9b768d88ad4ff7f55.pdf
    • https://static.usrfiles.com/ugd/963627_a297c77773954559a4f25183a5221c4e.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_dda0a95b1fad4429a3f8742c574ec925.pdf
    • https://static.usrfiles.com/ugd/cc14e4_886bf92dc39946a1b1ae8ab5f394fba2.pdf
    • https://static.usrfiles.com/ugd/b8c837_afef08e525ea48958788c233d9a71a03.pdf
    • https://static.usrfiles.com/ugd/4ae4db_14019445d7f8421d9b8cf851ec254e43.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_off00007371.bin
d52b5d1bc74b1f45f97fa5ec792a2de088b26a11e3abef37558f5abbec3cf080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7371 5192 bytes
font_01_sfnt_off00008515.bin
dedd394563a78ab38044a68b1fc64474d2dfacf0d83c520f65cc2a80a4c75680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8515 11036 bytes
font_02_sfnt_off0000a958.bin
e8a2a40c81204f68d188656ee186563bb41cec9665ac8bf1c139965098426a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA958 16080 bytes

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