Malicious PDF — malware analysis report

Static analysis result for SHA-256 b857d92cf7d3e9b0…

MALICIOUS

PDF

61.9 KB Created: 2020-09-01 04:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07abd4664a20ed82b975982fb28f8de4 SHA-1: 1ec200de1202fabbc53adc63231e801d0274a5df SHA-256: b857d92cf7d3e9b0c3aaf3ea3b85d2926dea7f95952d5cf9d3e1087d1ca936f2
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=azure+status+monitor', which is also listed as a malicious redirector. The presence of numerous external links suggests a link farm or redirection strategy to distribute malicious content.

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=azure+status+monitor
    • https://static.usrfiles.com/ugd/963627_d436010bc6ca4db3bc4109932ea7e693.pdf
    • https://static.usrfiles.com/ugd/e6092c_f9bd55a786344af7af488c3a1afbb6c6.pdf
    • https://static.usrfiles.com/ugd/516793_8ebebd753b2e4445b218bdc676a305ad.pdf
    • https://static.usrfiles.com/ugd/37428b_f94c8d123e4c4884bf6daa4ac00ee017.pdf
    • https://static.usrfiles.com/ugd/c3f88d_93fe82b2ab3240f0acb05232e68a6e9a.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/app_store_free_android_games.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/rockstar_movie_mp4_hd.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/wipewuzeluvelufedikimexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/hyderabadi_chicken_dum_biryani_recipe_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/thyroid_disease_in_pregnancy_rcog.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/crysis_3_pcz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/sinevuzuwuvilovoribeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/introduction_to_classical_mechanics_david_morin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/laminex_formica_warranty.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_off0000a8ec.bin
f92a6792b7c767e9c9f878da3aeaa79400faaa9b4120e78965dad90f7067b2fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EC 4836 bytes
font_01_sfnt_off0000b94e.bin
5b1a2adb9a36643316e2f56ba6979a61730ea9b6e0a481d17ccbb4778b89be85
pdf-font-stream PDF embedded font (sfnt) at offset 0xB94E 16088 bytes