Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e718a6cd6016e…

MALICIOUS

PDF

60.3 KB Created: 2020-09-08 04:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abcb56ebbd8f76263d23d658fa20e60 SHA-1: 4d0f1ebcb5483e325e82a0689740394a9b1730c7 SHA-256: 857e718a6cd6016e65071a2a2137ec25db2cfe546863f27215a30c3ae053a80b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'vocabulary words with meaning for ielts pdf' and the malicious URL. This suggests a social engineering lure to drive traffic to a malicious site. The presence of a link farm further supports the malicious intent.

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.me/pify?keyword=vocabulary+words+with+meaning+for+ielts+pdf
    • https://static.usrfiles.com/ugd/efc97f_a6ae39d7fac24b64afd6b32a0712be83.pdf
    • https://static.usrfiles.com/ugd/40512e_0ab123f84a9d4cc798bce36da0a53075.pdf
    • https://static.usrfiles.com/ugd/735424_509e91b5d620451a9cd7b160bf040390.pdf
    • https://static.usrfiles.com/ugd/b8c837_83ed7fecf43645cf9dda821df40c48f0.pdf
    • https://static.usrfiles.com/ugd/3835dd_3e0b2f46166e4dec886528aa163e1325.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/88386240640.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/9170210704.pdf
    • https://cdn.shopify.com/s/files/1/0454/5812/9054/files/mozobexutikuva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://static.usrfiles.com/ugd/39a0fd_2dd3cee955ee4f90a40a553059450c77.pdf
    • https://static.usrfiles.com/ugd/0047a4_2393144f22ff4d53abb9cfa626047871.pdf
    • https://static.usrfiles.com/ugd/18ee90_7e9ee33dd7c742dc917e93fdb9214a09.pdf
    • https://static.usrfiles.com/ugd/71fd01_730e64589abf451a822be97613499a9b.pdf
    • https://static.usrfiles.com/ugd/ed2d23_3c2037f000254669a2c8aa8c2960d562.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_off0000ad94.bin
2a7c4aca23ce9ba2882a7b0261c476a4799363c9a987632538838cb5e40984ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD94 5868 bytes
font_01_sfnt_off0000c17d.bin
853ac63e66b768dc05d76561afff51e1c7b42cca9967954adb1b444fbdbc0447
pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 10204 bytes