Malicious PDF — malware analysis report

Static analysis result for SHA-256 f075283f7a5a05c1…

MALICIOUS

PDF

48.9 KB Created: 2020-08-31 12:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f830ba5ed841f88fe60a9242eb46bb0e SHA-1: 0ad22f436892f8d7ffb908fb9dd510bab32a3524 SHA-256: f075283f7a5a05c1a9a3c3a6da86a3d59bc9afac8fbf02fd0f3156bbac20a630
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.cc/wix?keyword=5+branches+of+philosophy+pdf, which is likely used to lure victims into downloading further malicious content or phishing for credentials. The document body contains obfuscated text and references to 'wkhtmltopdf', indicating it was likely generated programmatically for malicious purposes.

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=5+branches+of+philosophy+pdf
    • https://static.usrfiles.com/ugd/b52961_f6c4ca53e5e84b23b2dff1b132696309.pdf
    • https://static.usrfiles.com/ugd/3b0c81_62daa4d6be384d41ac36c5bc3d0b5f9a.pdf
    • https://static.usrfiles.com/ugd/cafc24_2d3e634d18c2410b887d3aabda13b7d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4dd8bd25a5e492e891fe046cea3f4d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2d59f632084276a5dc9f2cc36a11ed.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/zomatosedegabuzipa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/morgan_anesthesia_6th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/gulotoretilafosewovupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/37094195101.pdf
    • https://cdn.shopify.com/s/files/1/0440/9052/3813/files/.pdf
    • https://static.usrfiles.com/ugd/15cd4d_845b14ba86074b67bd6e495534b9b3f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_109163e0a77c40919393e58b29782ac3.pdf
    • https://static.usrfiles.com/ugd/b77b08_21298d6cf517473e8635c84685ec5dca.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_48a6ed3357064a56a0cc8740e7ccad1b.pdf
    • https://static.usrfiles.com/ugd/bb13a2_c1bac713d7cb47f2a853adb6207ddd60.pdf
    • https://static.usrfiles.com/ugd/822ecd_e5d265c31db04e548ce6e81a0099b07f.pdf
    • https://static.usrfiles.com/ugd/f0e51d_c2c4690e0cf7475081733e314dd1e119.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
stream_005_off000099b6.bin
db6c0e95ec8bd10b0519654418cfac52dadb5b14d0da4afdbe68c448af0e83eb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x99B6 18376 bytes
font_00_sfnt_off0000646e.bin
e662d0ff1ac362da6b1075731586f316336e9fc3c8ab02e9181d517771c24ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646E 5512 bytes
font_01_sfnt_off00007727.bin
97c298aee0ca12af35fe54274ba7af2adc7710c4fe3551d3438d2d42d01b095d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7727 10128 bytes

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