Malicious PDF — malware analysis report

Static analysis result for SHA-256 86556e125396f7f2…

MALICIOUS

PDF

45.5 KB Created: 2020-08-13 23:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 276e4cc50e71531f833d3f2a7d0b920e SHA-1: 7d3426c3c006330a742932bc7f9214b9c4a71100 SHA-256: 86556e125396f7f2baff716ecde9888286ce3a23a78d5c55f38c1930ea38d16f
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to a TV show trailer. The PDF also contains a large number of links to external PDFs hosted on Shopify, many of which are benign, but the presence of the malicious redirector link is the primary indicator of compromise.

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/pify?keyword=girlfriends+guide+to+divorce+season+1+trailer
    • http://files.fusw.org/uploads/1/3/0/9/130969950/2269357.pdf
    • http://files.ashleyvoth.ca/uploads/1/3/1/3/131398117/2987986.pdf
    • http://relowa.forsiouxfalls.org/uploads/1/3/0/8/130874104/wipesem-motipo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/xrt_pro_diesel_downloader.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6230/files/77050519272.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/sapetekalej.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/59934602124.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/sejafekabaxezatakap.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/kagojozajoraxepuba.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/45778998664.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/97765466955.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/mozubulotegu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/78281639534.pdf
    • https://cdn.shopify.com/s/files/1/0428/9380/3679/files/westell_6100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/zowilaboxulirawexid.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_off00007390.bin
c51850bb176d07ab1b63c08547130b473c6ef5443401c0c9cd3dfbb650d38e77
pdf-font-stream PDF embedded font (sfnt) at offset 0x7390 5332 bytes
font_01_sfnt_off000085d5.bin
5e602c89512d7d0f33d3072e7c21fc85ffda8d3f5e5c44a1ad43a3f5b6a072f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D5 10192 bytes