Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d419e7fe013333…

MALICIOUS

PDF

34.5 KB Created: 2020-08-12 13:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c89f07fffbe3a5af5a8eb0701b104486 SHA-1: 83953a03314af35c43ad4c5516f90db1a33ef4d9 SHA-256: 31d419e7fe013333295265552fd3b2ebabe4ccc73de1a1b87ed8e1d01ccb87ca
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 external resources disguised as PDF files. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text, though garbled, contains a reference to the URL that is also present in the heuristics and IOCs, suggesting a lure to a malicious site.

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.ru/pify?keyword=atkins+fisico+quimica+volume+1+pdf
    • http://files.halfoftenjewelsonline.com/uploads/1/3/1/4/131413678/kazero_peruj_piwaxiferuro_riwoxapin.pdf
    • http://files.kidsdollarstuff.com/uploads/1/3/1/1/131164574/gonebaxanuti.pdf
    • http://bisek.ashwins.co.uk/uploads/1/3/0/9/130969723/situvuxawev_dotarimomikum_batovu.pdf
    • http://lexuxa.clovevalleycommunityfarm.com/uploads/1/3/0/7/130774993/0eb3d0314.pdf
    • http://files.area51scooterclub.com/uploads/1/3/0/7/130740458/japezarurizojadonozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/arduino_code_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/2789/8268/files/74530632655.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/attestation_employeur_pole_emploi_vierge.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/japanese_fat_snake.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/78985469414.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/ham_radio_license_manual_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/malaria_plasmodium_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0436/7787/6377/files/abacus_how_to_use.pdf
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/roxepoxexugijumerudiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/74692547766.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/octreotide_varices_esofagicas.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/12860618107.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/57466103081.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/vusurokilajex.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_off0000486a.bin
04e3d2d3a9c7e23eb38535be85e19bbc16f3a474c8ab45936a125f7b72a5e53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x486A 5496 bytes
font_01_sfnt_off00005b16.bin
e12acb009e71ae6a7ef911b5ba1f749ef846f9c69e7b5ec470db53e1a05b3fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B16 9972 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.