Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2164d526afb8a03…

MALICIOUS

PDF

49.5 KB Created: 2020-09-01 05:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1bc9d3998d5f45ffe2d52d52b82b56b SHA-1: 224d0ddae1ee463271532290d129487f53f103ec SHA-256: f2164d526afb8a0321d84db94ccf8d2a28aa3fcae1e9d82d93d8f656a8b7c445
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. This URL is embedded within the document body, which also contains what appears to be garbled text alongside the URL and references to academic terms. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The primary malicious URL is likely intended to redirect users to a compromised or 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.com/wix?keyword=aldol+condensation+product+between+formaldehyde+and+acetaldehyde
    • https://static.usrfiles.com/ugd/b8c837_8992c6c61f6a4a778ae1079b6b64cb02.pdf
    • https://static.usrfiles.com/ugd/4c76bf_9dc0310c8b0a4b309d8f0ee915b0b67f.pdf
    • https://static.usrfiles.com/ugd/6d59ab_6264a76c089649fca7ad0563a3fa47f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_45c65d7afac4466f8a70de0837cfa42f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6210fa0add848b795733c8bad17d172.pdf
    • https://static.usrfiles.com/ugd/b27199_66f3013c5b65442e9c6a1ee94a342d84.pdf
    • https://static.usrfiles.com/ugd/b8c837_743a26bed5e847c9bbbd96eeb19aa4b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b14eb682f704021adc5dfbf9910e8c5.pdf
    • https://static.usrfiles.com/ugd/451a43_fbd94b69f63c42b2b5df304e77a4cc9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2c3427f58f145edbda03a8c7c7d935a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af0223be4134b44aeaca6abddd61bdf.pdf
    • https://static.usrfiles.com/ugd/04c368_adda7656951848449df325169d8f2fd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_484be42ced9b46f7a6d9f943a8033444.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_a985083549ce468687ac2c67444aa65c.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_b8e384265dc547c7b7b470695e9caa22.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/35880515779.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/alfabeto_hebreo_completo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/adventures_in_babysitting_2016_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/4020/2142/files/kenshi_faction_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/41045265103.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_off000073e5.bin
3265a2ed6080bbaa9215dfaa1b1eb973ceccec08778b2418f4db692620875e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E5 5600 bytes
font_01_sfnt_off000086d0.bin
5adf70a6cc1b3bebd20bfc61e7719dbcf9aae76a765de9281c44ebd82dcb2887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 10376 bytes
font_02_sfnt_off0000aa1f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1F 4324 bytes

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