Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4938d74d535025a…

MALICIOUS

PDF

77.0 KB Created: 2020-09-07 08:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa21743e5b31b665a08e07ba625efe6e SHA-1: 710251c373a248600d2998250976bb3a5adeb5dc SHA-256: a4938d74d535025af113bf1e46d3dfd354cb27229b7530da5a75e879b4a5a744
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 significant number of embedded links. One critical heuristic identified it as a PDF redirector link pointing to a known malicious domain, ttraff.club. Another heuristic identified it as a PDF SEO link farm, with many links pointing to static.usrfiles.com. The primary malicious IOC is the redirector URL, which is likely used to lure victims into clicking through to a malicious site.

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.club/wix?keyword=pokemon+game+ultra+sun+and+moon
    • https://static.usrfiles.com/ugd/ca32a8_465f0ccab93a445ea0edfff01892db97.pdf
    • https://static.usrfiles.com/ugd/9904c2_05461c83207242ad8a859babbde97b34.pdf
    • https://static.usrfiles.com/ugd/d1c05f_a359bfd737d34bdbb670870b6fbb830c.pdf
    • https://static.usrfiles.com/ugd/40b9e6_0721ae0076b0493f82256e19924aa787.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/understanding_and_using_english_grammar_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0434/5269/4680/files/62917269965.pdf
    • https://cdn.shopify.com/s/files/1/0431/3979/3050/files/volet_roulant_solaire_bubendorff.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5687/files/zobosifaralijuka.pdf
    • https://cdn.shopify.com/s/files/1/0466/5193/2837/files/mufuduk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5805/2763/files/3143355589.pdf
    • https://static.usrfiles.com/ugd/9bd8c3_c469caabeb424d75866da8bc6c0a56fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c75bab433d8c4b67ad5ce6b245600aad.pdf
    • https://static.usrfiles.com/ugd/787b0a_787f49db45d84f37864d0f480874ecd7.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c482.bin
e9d4bc78c12dc40cfceef2cf2961e829ac2b59a1146aac405429924f20941770		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 9364 bytes
font_01_sfnt_off0000e411.bin
3d459660e6194fc48ccbd34d8b9d910ad56839f0b616f52bcf803d60eb962b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 5044 bytes
font_02_sfnt_off0000f51d.bin
f6a296e8c6a6745b7cf1789178fa31f68217322ec8eff96b8568b636859c281a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 10396 bytes
font_03_sfnt_off00011871.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 4324 bytes

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