Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1414b0d82290fa7…

MALICIOUS

PDF

43.3 KB Created: 2020-08-08 05:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e98fa1897fe1c97b2f6b4d9cd4b4f710 SHA-1: 193e318f0aff835d657ab11aced3196f8d22bf27 SHA-256: b1414b0d82290fa7f1b6f9145bf204cac2f1a1ffbc0c2e86c08707be43860bff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to external resources, which is flagged as a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=present+tense+past+tense+future+tense+words+table+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, while containing a title related to grammar, is largely obfuscated and likely serves as a lure to disguise the malicious links.

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.ru/pify?keyword=present+tense+past+tense+future+tense+words+table+pdf
    • http://boserute.southernbellepoundcakes.com/uploads/1/3/2/6/132695569/3212386.pdf
    • http://files.thedesserthatch.com/uploads/1/3/1/4/131408204/b332e9b.pdf
    • http://files.foodandfieldwork.com/uploads/1/3/1/4/131455832/xugaxomobububamamilu.pdf
    • http://files.eucharisticadorationlocations.com/uploads/1/3/1/4/131438667/8956114.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/autosar_documents.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93867881616.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55166802931.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/wolujixedodazol.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/dusozelusedanebukugudofap.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8214/files/avoir_conjugation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/fuxus.pdf
    • https://cdn.shopify.com/s/files/1/0440/1401/0518/files/pukizesubatedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7614/files/62865528566.pdf
    • https://cdn.shopify.com/s/files/1/0433/8145/7061/files/27885871747.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/45190797921.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/ginosodesajevifabopas.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dc5.bin
0db9ff208f4192ae4c0bc84fb6ff6dfa8642b63195d0cfc109e92974120fbfce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC5 5100 bytes
font_01_sfnt_off00006f26.bin
7703ca78eb4d5fe32f77d1a82b395732594b10d42f621aec0ddb63a96bd5cf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F26 10108 bytes
font_02_sfnt_off000091c4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C4 4324 bytes

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