Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4573e6bdc20f58…

MALICIOUS

PDF

119.1 KB Created: 2020-08-13 12:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64e2a41e8bd9538827ed1527da2ecb3 SHA-1: b97bdd289209f4bd0f127b13b066e5d711a12c9e SHA-256: 7a4573e6bdc20f580f870aee03eb8d6d339eb8fbf966ae47601b3ed300281a7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious URL, disguised as a salary negotiation guide. This indicates a phishing attempt to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=fearless%20salary%20negotiation%20pdf%20free
    • http://files.blazingblazers.com/uploads/1/3/1/4/131407968/lexirif.pdf
    • http://files.aspirationcommunityyoga.com/uploads/1/3/1/8/131856212/lajokifi.pdf
    • http://garewi.icthope.org/uploads/1/3/0/7/130739113/dd0306.pdf
    • http://files.n2-crafts.com/uploads/1/3/1/4/131438567/gileputalip_sogeza_suzofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/navixepokexumu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/lolapatuxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/suvorobaxup.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/amadeus_basic_training.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/10603862813.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6352/files/54330485298.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/bosux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/xiximanasuladolakamumapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8063/6833/files/ibps_po_notification_2020_bankers_adda.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/dugalikezamuramolotedug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/57237155247.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_off000198bf.bin
38312d88688dc16b40fe47cc2cac7b86c98275fa43a72e6e1f9b071afa303b03
pdf-font-stream PDF embedded font (sfnt) at offset 0x198BF 5264 bytes
font_01_sfnt_off0001aac0.bin
13b1b88e44a09fbd57e5c1be8f8068f1329cdf57a1ae11aba6a1156eeaccd406
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC0 10616 bytes