Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a84c0798c256c3…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 09:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c202a9223d1881564d2d543c0b32fab SHA-1: 7a454cb2fb6f909f5e2190622fef529fede67188 SHA-256: 77a84c0798c256c316c6695755fc20358a350d08f216f6b73bc0ca82a659837b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for spreadsheet-related content, directing users to the malicious URL. The ML classifier also strongly indicated maliciousness.

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=spreadsheet+excel+writer+php+example
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/kigesedejovemowul.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/batman_arkham_city_lockdown_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/pinewood_computer_core_code_3_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/teduxil.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/411636401.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7846/files/vavebeburigolukunupipurub.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/78649311353.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/insanity_meal_plan_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/xekax.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/28407701037.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/oxford_bookworms_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/asleep_the_smiths_piano.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd8e3d9ad5a3470aa862d8405275c42c.pdf
    • https://static.usrfiles.com/ugd/97aff7_b3c8f9b4fea84024b769a971d103c991.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b1a1b3a70334f8bac8ed6da4f39914f.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f47.bin
5207a43ad4bd0c20eb1d3fee5ed8178ae7ba3518e2aec4cb8a57446dbc139d02
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F47 5576 bytes
font_01_sfnt_off00007228.bin
0170c132604f56887d28adf251595b6960570961ed96e4b163b98cf6f48e3681
pdf-font-stream PDF embedded font (sfnt) at offset 0x7228 10044 bytes