Malicious PDF — malware analysis report

Static analysis result for SHA-256 778e5ad208c0a6a1…

MALICIOUS

PDF

43.6 KB Created: 2020-08-05 12:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a3551008276528cc4b1b69c06c1203 SHA-1: 9212c60dede059692e0959f31dcdc995b5b7b2aa SHA-256: 778e5ad208c0a6a141a90de59b2b83e98622c293c78d34a6acf9fc76337d2b61
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'paperstream capture manual name', which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm used for SEO poisoning or distributing further malicious content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/wb?keyword=paperstream%20capture%20manual%20name
    • http://files.helpingthoseleftbehind.com/uploads/1/3/0/9/130969772/8601755.pdf
    • http://files.jessrimington.org/uploads/1/3/0/7/130775971/608b9b5c72.pdf
    • http://files.eurasiandebate.com/uploads/1/3/1/6/131636692/vajaguzafire-pakaveme-legavifoxegug.pdf
    • http://dupunu.cassandras-corner.com/uploads/1/3/0/7/130738993/49fbd1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/55317444237.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/tifun.pdf
    • https://cdn.shopify.com/s/files/1/0437/1064/4377/files/dariboxofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1361/0404/files/predicate_sentence_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/50279447098.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5081520916.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/forewizoboretatolir.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/kisah_lengkap_ashabul_kahfi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/calculus_early_transcendentals_briggs_cochran.pdf
    • https://cdn.shopify.com/s/files/1/0436/6719/4021/files/liradabasajegewodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/wutokuwitijasixejajagoge.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/nejunefuxogalo.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_off00006513.bin
9b842e6312db372a3a6794a9fe31d606049e3c119c68a3f0cf10d4eaf6122ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 5080 bytes
font_01_sfnt_off00007644.bin
f618c26955324c008f61c2715a91beef99b7cca920e40c0027ae60b2ddc7e5cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7644 13360 bytes

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