Malicious PDF — malware analysis report

Static analysis result for SHA-256 1943655a5f4afda4…

MALICIOUS

PDF

137.8 KB Created: 2020-08-10 06:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88dc47bc1da9931e3d0373d42d5cfc74 SHA-1: 8d82064a77eb5ee5ea7de43887bf7cc3d2e14290 SHA-256: 1943655a5f4afda48a4be3b1923ae6d775e3cdcd1beb83a99c158c79f3b51256
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a link farm, with a critical heuristic identifying a malicious redirector. The embedded URL and document body text suggest a lure related to seismic stratigraphy, directing users to a malicious domain. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=seismic+stratigraphy+and+depositional+facies+models+pdf
    • http://wunibami.digcitinstitute.com/uploads/1/3/2/6/132683188/zagudinipusapup_jesaji_tutitobozini_munovusi.pdf
    • http://files.bustemupoutfitters.com/uploads/1/3/1/3/131380482/gilolegomipoz.pdf
    • http://mugadej.andale-eco.com/uploads/1/3/1/4/131453060/a9cbde3494b36.pdf
    • http://files.grundmeyerleadersearch.com/uploads/1/3/1/6/131636990/sifixoj_jutixepipi_bevasagipaxuja_sivosukisozi.pdf
    • http://files.neo-terra.org/uploads/1/3/1/6/131637546/5904605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2567/9015/files/romijikesakolumavu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/46703956319.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/84931339180.pdf
    • https://cdn.shopify.com/s/files/1/0437/2729/0518/files/esl_adverbial_clauses_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/81262978014.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/xawofolivurudoremotubi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3355/7149/files/conjuntivitis_bacteriana_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/midok.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/4442475121.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/allegany_state_park_map.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e05a.bin
aedfd573534377abf4df00ae73dfc920522a07076eeda0fd545042ed55672bcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E05A 5776 bytes
font_01_sfnt_off0001f3e4.bin
f13b8087146a2c6eb270532af3256c6a00f264e828388050e43883a50104f197
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E4 11300 bytes