Malicious PDF — malware analysis report

Static analysis result for SHA-256 b075b5c0ca72171d…

MALICIOUS

PDF

38.8 KB Created: 2020-08-24 19:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c94d4b5edf18901cc6d01645dfa2a54 SHA-1: 2835781b56c9db7054c4fc847e1a5e070fbd8360 SHA-256: b075b5c0ca72171d5ccd80f10db69ecc2b7c3e5d5b87900f8c2cb2d75b9f5134
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/pify?keyword=hestra+votter+str+guide as malicious. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content widely. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=hestra+votter+str+guide
    • http://fuvar.neighbors4christ.org/uploads/1/3/2/6/132695663/1607808.pdf
    • http://files.thegeorgetownvault.com/uploads/1/3/0/8/130874554/45a6832.pdf
    • http://files.celebrityartbypam.com/uploads/1/3/1/6/131606672/kozezanibowowos_wowazetas_wisil_rusetazifiv.pdf
    • http://files.aspontaneoustraveler.com/uploads/1/3/2/7/132741389/32a12145d818dac.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/40277190521.pdf
    • https://cdn.shopify.com/s/files/1/0429/9109/1875/files/kibowafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/52150098826.pdf
    • https://cdn.shopify.com/s/files/1/0434/1419/2284/files/bakery_equipment_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/19423835787.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/high_density_lipoprotein_cholesterol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/pewanewejifidozasidoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4404/files/29985736107.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/98298805281.pdf
    • https://cdn.shopify.com/s/files/1/0437/7470/5815/files/jawimuzakojajofexagujurug.pdf
    • https://cdn.shopify.com/s/files/1/0428/4337/3735/files/adenocarcinoma_de_colo_uterino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.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_off00005b53.bin
094de97d77a246cb569e3a6e1f3e61132fe642c8cadd7d49ec8aaeb875286040
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B53 4984 bytes
font_01_sfnt_off00006c56.bin
d241afea5c30b224f91a601f0beac3dd90c9d283c18b1cfb4c7b280adbbb0b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C56 10008 bytes