Malicious PDF — malware analysis report

Static analysis result for SHA-256 561c69dac6cb4c26…

MALICIOUS

PDF

37.2 KB Created: 2020-08-05 05:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08b96bec951b8bbaf1d7b8713dc00481 SHA-1: 355e147e8471ae46b0c90c1fe47532f6b607e212 SHA-256: 561c69dac6cb4c2616c1e1e71addfc87a117699e89ecdb3ff38e0435ea862536
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to a known malicious redirector, ttraff.com, disguised as an apostrophe worksheet. This indicates a likely phishing or malware delivery attempt. The ML classifier strongly supports the malicious nature of this PDF. The document body, though malformed, contains the target URL and references to worksheets, reinforcing the lure.

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/pify?keyword=apostrophe+worksheets+with+answer+key+pdf
    • http://files.styersconcreteandconstruction.com/uploads/1/3/2/6/132680869/bujilenadodok.pdf
    • http://files.leatippett.com/uploads/1/3/0/9/130969194/6920734.pdf
    • http://files.mrscorleysclassroom.com/uploads/1/3/1/3/131383604/5678689.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/canon_super_g3.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8713/files/84505044181.pdf
    • https://cdn.shopify.com/s/files/1/0438/3821/0205/files/78795364268.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/435051941.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/97956458448.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/89100050455.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/guxerilemugoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/jalitiviri.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4330/files/wokavopizaxuneliwog.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/dofasidepelif.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/cuales_son_los_derechos_humanos_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/63210083796.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/tixinuvimarewatini.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_off00004867.bin
38582cc7b7ad2e19b8377e67b7ed703d92729295481d0fd8af02dc0738c45869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4867 5132 bytes
font_01_sfnt_off000059e1.bin
c2f7b507ecfded2e0fbfd5098c3959a38b181e069206a04c69858bcb11b3dabd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E1 9340 bytes
font_02_sfnt_off000079b2.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B2 4324 bytes

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