Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9af5d66581513a…

MALICIOUS

PDF

52.9 KB Created: 2020-07-23 07:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a7b07e70dbbf08e329d7da0acd08574 SHA-1: de14d182c3c6d414aad6c1d55b845e12bc33fb19 SHA-256: 6a9af5d66581513a7bc65bde46076e45b1aa6f677c884ebed062c621dc2899e1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Amcas application pdf'. The presence of multiple external PDF links, some pointing to potentially compromised or malicious domains, indicates an attempt to direct users to harmful content, likely for phishing or malware distribution.

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.com/pify?keyword=amcas+application+pdf
    • http://files.elrinteriors.com/uploads/1/3/1/4/131453817/dumulemibiw_xefatijimumugij_jamiladatetexo_rorafure.pdf
    • http://files.westlakepetvet.com/uploads/1/3/1/3/131381946/kenuto-jexewes.pdf
    • http://files.vision-batteries.com/uploads/1/3/1/4/131453934/fcf2a2e4a25141f.pdf
    • http://files.marksturgess.org/uploads/1/3/2/6/132682030/gadiloforasid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/21258956037.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/donejugutakusag.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/81349270351.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5791/files/resojobinumuvojolifivem.pdf
    • https://kebubajogi.files.wordpress.com/2020/07/jubozugamabimilo.pdf
    • https://zodizijemas.files.wordpress.com/2020/06/masexojanusivovetazemeg.pdf
    • https://nenutarutu.files.wordpress.com/2020/07/zolotoso.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/95392747409.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/vesanokegubugomusarek.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/ruvoduganetigowog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76685421079.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/16924515599.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/mamumubukasasirenagotufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/jonunaloxisubuki.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/jutifarexepugekumok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6718/7108/files/pewuxus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/fewuvonulesexivusefuwunux.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_off00009253.bin
8c9fe68bbdc0b915f68f4c472569446c9b7d98d4092ad0761f2ea08f4d136a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9253 4864 bytes
font_01_sfnt_off0000a2b2.bin
a7eeee8968e1ebe0400296aa6a3be7f0a00c2a6b185759a715b68c6a2cb36796		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B2 10532 bytes

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