Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ab5a81d518b6ee…

MALICIOUS

PDF

40.4 KB Created: 2020-08-14 08:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed03d852260b45206e5c75f0c0a3ab86 SHA-1: f2472827a90bc398dc66b3dffcda9b7161ebd104 SHA-256: 88ab5a81d518b6eec8f2da4f046be8609aef31c30744a1627d69c94348ad89c8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though corrupted, contains a URL that matches the malicious redirector, suggesting an attempt to lure users to malicious content. The presence of numerous external links points towards SEO poisoning or a phishing campaign.

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=emiway+songs+video
    • http://files.singwithbscs.org.uk/uploads/1/3/0/7/130775970/dabobakeguso.pdf
    • http://lepugulu.catherinecarterpainting.com/uploads/1/3/1/4/131452883/mawelumisepuf.pdf
    • http://files.franklinlegacyfund.org/uploads/1/3/1/3/131398102/44d51bcd.pdf
    • http://files.aeseric.org/uploads/1/3/1/8/131856772/sazomekifaz_sasaxozijekera_pepozabe_likuweluj.pdf
    • http://files.shortandhelpfulonlinewriterworkshops.com/uploads/1/3/2/3/132303219/2078283f05b983.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/nedosotegafusatigov.pdf
    • https://cdn.shopify.com/s/files/1/0438/4178/1920/files/zafowitafivef.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/breathing_exercises_for_stress.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/96055522687.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/xugipiwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2296/5160/files/rinimewinumunav.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/pojudisira.pdf
    • https://cdn.shopify.com/s/files/1/0448/9232/3995/files/2507583020.pdf
    • https://cdn.shopify.com/s/files/1/0437/6880/7586/files/bengali_to_english_dictionary_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/sinevevevutaburexozoguxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/jowadeduwanudi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/masolonanaxirigaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/lonexegifabelebixetafe.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_off00005450.bin
6d00fbe4d3c54e134ef607b3b48703f8a54b78d2eb216d47927e225ba288f9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5450 5228 bytes
font_01_sfnt_off00006629.bin
a34929e2156af0364ce0c215e25a54f6c280823a1b8393979054ee6d391e415a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6629 14444 bytes

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