Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4c6a068c93f192…

MALICIOUS

PDF

36.6 KB Created: 2020-08-08 07:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa36bc949875010c4cd01d1f641eb3e2 SHA-1: 44da21dcfee63651ce6ddf10b71025fb3bdf6632 SHA-256: 4c4c6a068c93f192bb02c39dfe85c2dc57853f97614641ade5e8c4fbb9fb711c
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 domains associated with link farms and redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a social engineering attempt to drive traffic to malicious sites.

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=kiadb+bye+laws+pdf
    • http://files.aulayaiqsimarugut.com/uploads/1/3/1/3/131382841/dakuxenetakomowim.pdf
    • http://files.kypba.com/uploads/1/3/2/7/132710592/galalezujuru-patovufove.pdf
    • http://files.marinachristopher.com/uploads/1/3/0/8/130813755/552a3edda5b0.pdf
    • https://cdn.shopify.com/s/files/1/0430/3237/9545/files/luduzujilifixojovuti.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/zevererusafekigimazezofi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2723/4969/files/tatibakumufarejozere.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/edit_text_editor.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/www._codejunkies._com_manual_3ds_powersaves_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/gadutamugodan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifivejeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5816/6941/files/javascript_array_size.pdf
    • https://cdn.shopify.com/s/files/1/0431/2501/4685/files/buxapujure.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/femekanazafudowera.pdf
    • https://cdn.shopify.com/s/files/1/0431/3769/5895/files/duliduzid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7714/7547/files/bikalufigepakisab.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_off00004684.bin
234666a6527a9e59ca7801ed0f3975df00cead2c0a3bc7900e010c46c671bb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4684 4736 bytes
font_01_sfnt_off000056b1.bin
11ccf3b54822365c1bf30a55b379d09830484979390ee7a065c10241c0319bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56B1 9624 bytes
font_02_sfnt_off00007795.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7795 4324 bytes

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