Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b25da598d0e5f9…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 04:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5ec4e6a7bcaba4add9a7fbd44f9eb65 SHA-1: 82708fea758e0cb2daf8474eb854f42b109490ef SHA-256: 71b25da598d0e5f9fa55daff5b9df1c7da7a4678921cf4d498c8455cb50741db
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=vocabulary+word+map+graphic+organizer+template', suggesting a lure to a phishing or malware distribution site. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm for SEO manipulation or broader distribution. No scripts were extracted, but the PDF structure and malicious link strongly suggest an attempt to redirect the user to a harmful site.

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=vocabulary+word+map+graphic+organizer+template
    • http://files.nagia.org/uploads/1/3/1/4/131407406/5669118.pdf
    • http://xozukajus.altapassbaptistchurch.org/uploads/1/3/1/8/131872054/panolabumozu.pdf
    • http://jajum.411mediatalk.com/uploads/1/3/2/6/132696526/dazenupozal-japunilo-viwori.pdf
    • http://files.lorindaforrest.com/uploads/1/3/1/6/131637178/2070375.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/vatexanesafipesarukorat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/josulimup.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/corporation_law_bar_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/kokefitomivaxevog.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/60743346674.pdf
    • https://cdn.shopify.com/s/files/1/0429/7228/3033/files/28005756023.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/87886044225.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/belly_fat_burning_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4293/files/bradford_pa_weather.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/piromupupovowuwixixani.pdf
    • https://cdn.shopify.com/s/files/1/0457/8669/3798/files/free_employment_contract_template_canada.pdf
    • https://cdn.shopify.com/s/files/1/0462/4941/0714/files/wow_joana_guide_addon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c9b.bin
fa2d94f0a72f3f31ed93b6dac21ef069ed1432c3e1297db6e69b1ef70b21af55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9B 5540 bytes
font_01_sfnt_off00006f5b.bin
256081fa08c292bc29d745ea9f125d54b8518cce0351ad832afe33f4fc95d641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5B 10448 bytes
font_02_sfnt_off00009303.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9303 4324 bytes

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