Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef115305f8c309fb…

MALICIOUS

PDF

45.6 KB Created: 2020-08-24 21:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14df33183d0ec993912150253dc52b6c SHA-1: 8405dcadbc8b5cbe152e460ad1176a7c315a83b8 SHA-256: ef115305f8c309fb37c7d877c22ef611c56eff09f697d8355698546abe638420
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=el+diario+de+la+republica+clasificados+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title, suggesting a lure to a malicious site. No scripts were extracted, limiting further analysis of execution behavior.

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=el+diario+de+la+republica+clasificados+pdf
    • http://batobumi.workshoots.com/uploads/1/3/1/4/131438003/venunedalupomuneg.pdf
    • http://files.hellokels.com/uploads/1/3/1/3/131379268/eb08d274e9a100.pdf
    • http://files.artchaucer.com/uploads/1/3/2/7/132710601/bezox-papep-bosexesokuxuwus-kijetese.pdf
    • http://topepegun.morrisshootout.com/uploads/1/3/0/7/130776677/5c68186b2b.pdf
    • http://files.parksidehighschoolfootball.com/uploads/1/3/1/1/131163666/dfbcc26.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/nunososipij.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2752/files/kisan_panjiyan_report.pdf
    • https://cdn.shopify.com/s/files/1/0445/8142/1215/files/how_to_make_alkaline_water_at_home.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/sigamigevuturadot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3812/1895/files/saxani.pdf
    • https://cdn.shopify.com/s/files/1/0450/6845/1992/files/traitement_chlamydia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/miwanole.pdf
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/google_docs_reader.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/bureluxonudunodifonewuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/ladixudavanizijezizavuti.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_off000064c4.bin
7ebf8c6efd419a56bdbae03d253077fafd02779365d4279ecbcab8dcf566d0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 4944 bytes
font_01_sfnt_off00007595.bin
c5832f09c5fc5727463439794a83c32d7429ac52c01052320c87e551603b10a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7595 10940 bytes
font_02_sfnt_off00009967.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9967 4324 bytes

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