Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3024eb2ff60f4c…

MALICIOUS

PDF

40.3 KB Created: 2020-08-25 05:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcb7d5afb32a5041b61f7767702ba1e5 SHA-1: 77b285d61d52f91c4feffe00c1613b94f07e2757 SHA-256: 4b3024eb2ff60f4cd6a1ccc5dcdd1f9cec8f425db18bc6b96650994fcb572fff
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=honeywell+thermostat+guide+pdf, suggesting a lure to disguise malicious redirection. 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.ru/pify?keyword=honeywell+thermostat+guide+pdf
    • http://files.thecherigroves.com/uploads/1/3/1/3/131398156/0c09cff1c7.pdf
    • http://files.alebml.com/uploads/1/3/0/7/130739239/3594939.pdf
    • http://files.brisbaneblonde.com/uploads/1/3/0/7/130776110/fopurugos_vopuwofujevipad_lokenanefi_zakesemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0432/1941/9291/files/mivojadere.pdf
    • https://cdn.shopify.com/s/files/1/0437/4390/3905/files/73492797187.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/60995664881.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/nuferara.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/comment_arrter_de_boire_de_l_alcool.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/kabbalah_magic_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9698/files/jafumot.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/31762043617.pdf
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/xarazeb.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_off00005dd2.bin
8a35de0198c6491679967afa5edb57c707273b29ea792e30d68c4a8ac937ee03
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD2 5612 bytes
font_01_sfnt_off000070cf.bin
8fc21eb98373271a0f04fc5c5ef1ff97fcc90797ecb11258acdb968119be837f
pdf-font-stream PDF embedded font (sfnt) at offset 0x70CF 10524 bytes