Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a1099ee3c7a4ca…

MALICIOUS

PDF

45.4 KB Created: 2020-09-01 22:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb304dc33bfbe73ea44dc5a24cda1f61 SHA-1: 63ed50b2476054d8dab61d4dfe0c3a17d140432e SHA-256: 80a1099ee3c7a4caf9efe52f18d35d8ce77282d0e132e64e9afee4115cb00314
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a book PDF, likely to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=stay+hungry+stay+foolish+full+book+pdf
    • https://static.usrfiles.com/ugd/ed2d23_9795c35294d44de98cc2316d848d2b01.pdf
    • https://static.usrfiles.com/ugd/5926b4_00cc30a754094b029024714b734c20e4.pdf
    • https://static.usrfiles.com/ugd/4c76bf_ad12d92bff1547d29d51fab57243d486.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fc8daabb3e348a482a82c51831bc10a.pdf
    • https://static.usrfiles.com/ugd/11f207_388d4619c94246b5bb1d79d559b3cc08.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bb73b75561047939d52aa76e6e8a4b1.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_23aaf1c4b9ed46d48ff4f0080de83adb.pdf
    • https://static.usrfiles.com/ugd/917232_0f9dca6a9d094f968fc842c4d077ec50.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_d8b17fddaedd42edbd629ca66c7b5f4a.pdf
    • https://static.usrfiles.com/ugd/21e6f2_43ee7a05a48d4a5eac91966a95f3be56.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/vevuzojivubelipulejikad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/fewibosadiwuruwal.pdf
    • https://static.usrfiles.com/ugd/b8c837_6902fd47bee947a9aeb8e43c9f1216b1.pdf
    • https://static.usrfiles.com/ugd/b88e3d_b0102b3bb544447cab63c046882ab147.pdf
    • https://static.usrfiles.com/ugd/0f5b72_c429be6909be42b48c107344bbb1f97e.pdf
    • https://static.usrfiles.com/ugd/078c79_6e2ce6794be342959ce1868f25a84557.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_ce51dd0d721343138fdf3a138af2f7b3.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_off000071ba.bin
c874299fd4f72dc8a171a7737829179f94c9659dae3a57d53a76349a8cb2e6ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x71BA 5712 bytes
font_01_sfnt_off00008527.bin
4bb314a9f02c520eb4754caa20feb7eb9fec431858a44644697ac507c75267d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8527 10416 bytes