Malicious PDF — malware analysis report

Static analysis result for SHA-256 622bd0f72e794844…

MALICIOUS

PDF

43.3 KB Created: 2020-08-13 21:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b7322c5dcd792c240ec57ba5c2bf084 SHA-1: 17cac1f675b4cfdf1b8909ca1637403fe886b75a SHA-256: 622bd0f72e794844693005d4bb657f985bde1498dd37070d083e54c9d156ade6
162 Risk Score

Malware Insights

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

The PDF contains a lure related to debt collection and a link that redirects to malicious infrastructure, indicating a phishing attempt. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of numerous embedded links, including one pointing to known malicious redirector infrastructure, suggests the document is designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=dispute+debt+collector+credit+report
    • http://files.springvilleffa.com/uploads/1/3/0/7/130775808/5cb3f59de363cb5.pdf
    • http://files.jonathanpschwartz.com/uploads/1/3/0/7/130775959/zoloxemel-ziranufalazuvi-riwimakevatupa.pdf
    • http://files.akadeltaomegaomega.com/uploads/1/3/1/6/131607635/3994755.pdf
    • http://files.aanenetwork.org/uploads/1/3/0/8/130873995/gemosiboxaxipi_zuleg_lupoxoxu_defekabixomizit.pdf
    • http://files.thomasklassen.net/uploads/1/3/1/4/131452804/pamolukuxer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/42146769460.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6599/files/list_of_bharat_ratna_winner.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/lamuduwoxow.pdf
    • https://cdn.shopify.com/s/files/1/0435/1059/5748/files/21951782170.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/sikulevimosufufafola.pdf
    • https://cdn.shopify.com/s/files/1/0433/9718/5701/files/82175443677.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/nyc_subway_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/muvowojavobej.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/73171262263.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/einstein_biography.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/berliner_platz_1_neu_deutsch_im_alltag_intensivtrainer.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_off00006aae.bin
b56ce52aae6ba4fe50189f27803764a7fb09a54fe943b9520ac3988243272cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAE 4996 bytes
font_01_sfnt_off00007bac.bin
6f2bd1678daa7657303b9b6cdf51b618e2376436c96fb0f8394a0f8e5aa70ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAC 10700 bytes

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