Malicious PDF — malware analysis report

Static analysis result for SHA-256 3474a0d3b17c57ca…

MALICIOUS

PDF

33.8 KB Created: 2020-08-10 01:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0787d3b85ae29dcdd325a14268f829 SHA-1: e755e720569c01686ed4f6e37c3e9d4560cbda61 SHA-256: 3474a0d3b17c57ca598ffc09e24fece0ba9ca6007494fc0f048ca4b74ddd5712
154 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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a lure to a malicious site. 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.cc/pify?keyword=mixed+tenses+exercises+present+past+future+pdf
    • http://files.robertjlancaster.com/uploads/1/3/0/7/130739776/d890c6484186d.pdf
    • http://xanozevew.sweatcardio.com/uploads/1/3/0/7/130775162/goruzewog-neletev-mofupinufix.pdf
    • http://files.cornhoartist.com/uploads/1/3/1/4/131409498/4701337.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/budabafematizalod.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/funes.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/92562027886.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/fugikutebip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/salovigosajaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5792/files/61966340019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0433/8348/8679/files/cost_of_discipleship_bonhoeffer.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/mapa_barcelona_ciudad_callejero.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/bujanegizonexadesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/zisawovijalusibolaxufaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/b_arch_drawing_questions_with_solutions.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_off00004693.bin
e43824c3814362ed642d33c879a0b8121768fd19ea7d753e5ee1d931c9653d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4693 5192 bytes
font_01_sfnt_off0000585e.bin
f2e70f514f5439254656e70b2493740b4e1b8b8077f3be698c1f1e1dbd2b26d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x585E 9876 bytes