Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa40e42ab102cfdb…

MALICIOUS

PDF

70.0 KB Created: 2020-11-17 20:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1969378e1aea513a24ba8111a23c39c4 SHA-1: 5d8acd2c0301a26150665968feea1b19c2b02d62 SHA-256: aa40e42ab102cfdb7ed74925768f63c9c94d64e00de60df285e3bdda95276553
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on Weebly and appear to be part of a link farm designed to obscure malicious destinations. One critical heuristic firing indicates the PDF links to known malicious redirector infrastructure, specifically `traffmen.ru`, which is used in conjunction with a lure related to 'Assassin's Creed Rogue'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=assassin%252527s+creed+rogue+naval+campaign In PDF document text
    • https://zivawopoxiba.weebly.com/uploads/1/3/4/3/134355714/396367683.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/6438177.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/poralujoneno.pdfIn PDF document text
    • https://gerexogevi.weebly.com/uploads/1/3/4/4/134463414/xeworujaremoroboj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fa005ede68ff.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/sufiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f8fec27c9e59.pdfIn PDF document text
    • https://mazemisa.weebly.com/uploads/1/3/4/6/134692176/ea61031cc9.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/d3cb1.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/poxanu_nobawokaxivegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/a_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/totamelizaxasadido.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/kms_activator_windows_10_education.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/juresumewafogudurebu.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/star_chindy_2.4.3_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/rogojobugid.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 5476 bytes
SHA-256: ca9d63b766294456d3aa1741e5fe0550ba060c4634104246abf1fe7e84954439
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 9768 bytes
SHA-256: 50fbe1a5973d45bdbf837e19cbcddd078dc6304fd110bd8ff15607a447c57943

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