Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e62b0cf4146657…

MALICIOUS

PDF

37.6 KB Created: 2020-08-05 01:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376b092ca277b8a0416f3d0996471849 SHA-1: a99ca58fa3e4b7c5387e2dbf799e1831df0ba301 SHA-256: a6e62b0cf414665733ab1b3df96f8e9f1ff51182733055126bac66f5b3b67717
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=br%25C3%25BCche+addieren+aufgaben+pdf, is identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirection attempt.

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=br%25C3%25BCche+addieren+aufgaben+pdf
    • http://files.durablecaster.com.tw/uploads/1/3/1/4/131437701/denukoxi_filapilure_naguletojujapog.pdf
    • http://files.elkdalebaptist.com/uploads/1/3/0/8/130813782/29fd8.pdf
    • http://files.alexherrald.com/uploads/1/3/1/3/131398095/6872731.pdf
    • http://files.myartisticdentist.com/uploads/1/3/0/8/130874246/xanosir_zawosolevotu_naburu_gijorajokozuwap.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/govovobijekixifesubujor.pdf
    • https://cdn.shopify.com/s/files/1/0429/5409/6806/files/77233787115.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/wotlk_jewelcrafting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5603/7017/files/79777613072.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7936/files/embryology_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/dnd_sorcerer_spells.pdf
    • https://cdn.shopify.com/s/files/1/0439/1819/6891/files/83985556905.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/vuvidulafumu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/demifesejekerasuje.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/20979753245.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_off0000526d.bin
6ec5cac5592eb234eca457a8afb11bfcd99136c0e8f20a0e0bf77a42ec10bb0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x526D 5516 bytes
font_01_sfnt_off000064f5.bin
b3ae3732bcd8a4c10241af1db8976be6533bf8462ef5855181f86ad653a83d4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F5 10600 bytes