Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3cbc4b71ef39b4…

MALICIOUS

PDF

48.0 KB Created: 2020-08-19 00:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e075cd6a419ca1ca9896a56a2bfbc46d SHA-1: ac9c11b1feee86f5b57a7d499643443557aa0f74 SHA-256: 9b3cbc4b71ef39b4272853d8a3d42d5a4f0f97b358d99accc7de52568db2875e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is used to obscure the ultimate destination. The document body, though heavily obfuscated, contains the same URL. The ML classifier strongly indicates maliciousness. The PDF also contains a large number of external links, many hosted on Shopify, which is characteristic of SEO link farms used for traffic redirection or phishing.

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.cc/pify?keyword=navigation+using+google+maps+android+api+tutorial
    • http://files.nsportsreccenter.com/uploads/1/3/0/8/130874458/97c29832f51a28a.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/87043211065.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/94257722078.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2529/files/arduino_micro_pro_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4266/8698/files/dabinerepinoxako.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/74897836200.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/90161964346.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/gasiligito.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/darrell_sheets_instagram.pdf
    • https://cdn.shopify.com/s/files/1/0429/1372/6631/files/fiberosajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4250/3832/files/rinenizot.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/epidemiologia_basica.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/kejabadotade.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_off00007021.bin
09ff9e37af4329117f5fa3e7bb1badc87fd1be9985da57996c968c36749c55db
pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 5192 bytes
font_01_sfnt_off000081b6.bin
9f3ecb6ef909ef317cce1aeb09e09a05abdd50ba78e44f01acbf1cd70466f3b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x81B6 10196 bytes
font_02_sfnt_off0000a4a7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A7 4324 bytes