Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4ecbade419652c…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 05:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddadfd2dbda518275e9a8fb1e84012ed SHA-1: 295d17b7fbfb49cc8daf395b52645897479c5134 SHA-256: 1a4ecbade419652c7907395e55dfecbb09dfe1183cfe2422107b5b5affcb19ac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, disguised as a free audiobook download. This is further supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing. The document body contains obfuscated text and multiple embedded URLs, including the primary malicious redirector and a large number of benign Shopify links, likely for SEO manipulation. 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.com/wix?keyword=the+great+hunt+audiobook+free+downlo
    • https://cdn.shopify.com/s/files/1/0433/6104/2591/files/gta_5_stunt_jump_locations.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9320/files/android_screenshot_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/dajovirakomobedipisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/70623812362.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/naqaab_bengali_movie_all_video_song.pdf
    • https://static.usrfiles.com/ugd/b8c837_005882a4fa324a5691640cd1ef84b234.pdf
    • https://static.usrfiles.com/ugd/0047a4_85b35ae131d84009a318aacc191624f3.pdf
    • https://static.usrfiles.com/ugd/2ca09c_01369c8723a0499abbf03022468e9f97.pdf
    • https://static.usrfiles.com/ugd/078c79_6652b6be97824e799cc6bab3dee9f9dd.pdf
    • https://static.usrfiles.com/ugd/cc14e4_7b90ba58134544e88b5092532c4e1630.pdf
    • https://static.usrfiles.com/ugd/105a8c_c7d6614e973e418d902f0f35fb9853f6.pdf
    • https://static.usrfiles.com/ugd/ef7b09_846b56cbf5d147f3a15dfc9432e8e6e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_91508e7358304576842ae55e365186eb.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
font_00_sfnt_off000066f4.bin
f30479521e503727ee944aa96cee299a7c917d94d69da162073d06522cbbf8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F4 5116 bytes
font_01_sfnt_off00007869.bin
f27fd07567ea067cb0595bf26aa1ad2b55abc71eacd99fdd98c90e0e75c65c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7869 10312 bytes
font_02_sfnt_off00009b3a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3A 4324 bytes