Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc5270aaf374c61…

MALICIOUS

PDF

43.2 KB Created: 2020-08-25 11:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 042d870baa7136deaf8892bf43e77ba2 SHA-1: 17ddd02aad832c587dffd3078401065584124e64 SHA-256: 0fc5270aaf374c61789618685e775cd46f4723aa94a3f108d58774c2b40c07f0
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, contains text related to interview questions and answers, suggesting a social engineering lure. The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', further indicates malicious intent to distribute harmful content.

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=top+customer+service+interview+questions+and+answers
    • http://files.advancedcleaningmobiledetail.com/uploads/1/3/0/7/130740517/puveri-xajepize-dosuxa-ratulagoru.pdf
    • http://vipoze.graindesigns.co.uk/uploads/1/3/1/4/131409090/dogexekifazixi.pdf
    • http://metuvife.equalityethicaltrading.com/uploads/1/3/2/6/132681862/a583d8cc18.pdf
    • http://pudulezuj.graphiclibrary.org/uploads/1/3/1/4/131437318/mevujodufilew_sefevuno_bosubunulun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/wawusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/74205241034.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/lavuduz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/figejegozupudezidovotizek.pdf
    • https://cdn.shopify.com/s/files/1/0436/3668/7008/files/movies_278_hiram_showtimes.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/kuwamezevebaluwudebomojek.pdf
    • https://cdn.shopify.com/s/files/1/0435/4850/8311/files/english_grammar_tenses_rules_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/ronetomazawuduz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/58617670148.pdf
    • https://cdn.shopify.com/s/files/1/0437/1136/5288/files/28257775497.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_off00006ad9.bin
a0e4f45a70e58fe0225a6ee1c0a7aa6ec2bdb1ec699ab1d5adafbff1f271ebf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD9 5416 bytes
font_01_sfnt_off00007d36.bin
d6a42461aac6c98849c99600e6756a74b220ff6141e314cb6b3dd4af195ffd3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D36 10416 bytes