Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8152d880a6856d7…

MALICIOUS

PDF

58.5 KB Created: 2020-09-01 01:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eedf2805ac666fda41fafd9814ac5c45 SHA-1: bde846a6bb4d497db2f36b2602ba3205e07d3cba SHA-256: f8152d880a6856d77fba16d43e0ae3871d7b16ef666d7070d46cd3e1b5e9d772
152 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=basic+spoken+english+words+in+tamil+pdf'. The document body also contains this URL, suggesting the primary intent is to lure the user into clicking the link. The file also exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com, though the primary redirector is the highest concern.

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=basic+spoken+english+words+in+tamil+pdf
    • https://cdn.shopify.com/s/files/1/0431/3094/5693/files/bixazewuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/66573155345.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/85246182962.pdf
    • https://cdn.shopify.com/s/files/1/0461/7076/7512/files/94530986031.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/hempathane_55210_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9410/5509/files/black_maxx_tuner_update.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/bradley_dolls_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/89035115415.pdf
    • https://cdn.shopify.com/s/files/1/0437/3023/9642/files/belgariad_book_4.pdf
    • https://static.usrfiles.com/ugd/07625c_55293f50ec8a4480b23a28bdc6002344.pdf
    • https://static.usrfiles.com/ugd/111c46_34618947016f4e5592d053ca2fa8fff8.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/xaguwegexofoxe.pdf
    • https://cdn.shopify.com/s/files/1/0439/3045/2123/files/zedeve.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/traveling_salesman_problem_c.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
stream_004_off00008b58.bin
5886a422679243d0f82577ea45a2e82e69b7af5606a22d848913f091775bd8d9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8B58 17540 bytes
font_00_sfnt_off000077c8.bin
c945b067e30b47f1d4ad2fe355b710ffff797bf027de728fbc18ce4a254464ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 5772 bytes
font_02_sfnt_off0000b312.bin
c26f7c56bcf71a654f2a1b846d2eda85f764b46a0b5c0c883d2bc735bd01d9b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 13368 bytes