Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1d321d8994086a…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 15:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 192443f35f10c664fb4f837e9a2f9f90 SHA-1: 89c3240bd0d37e530d78fbedd22ef2dfe730fee0 SHA-256: 9b1d321d8994086a9d5a222b0bd2d215ea655256eedfe91a125346721c0f401b
152 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 Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, contains text related to 'Metformin er 500mg for pcos', suggesting a lure for SEO poisoning or a phishing attempt. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead users to harmful content.

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=metformin+er+500mg+for+pcos
    • http://files.bulbgaria.com/uploads/1/3/1/6/131637240/xolora_lufibiwuv_jigusoxorib_naret.pdf
    • http://titekaxi.2cvtv.co.uk/uploads/1/3/1/3/131383483/befulip_mezevuralumim_zezajakud.pdf
    • http://files.beemountainllc.com/uploads/1/3/1/4/131437832/8969115.pdf
    • http://filugix.winonaffa.com/uploads/1/3/0/8/130874493/zunujavu.pdf
    • http://files.alamosavalleyhumaneleague.org/uploads/1/3/0/7/130775174/5445521.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/17170775957.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/annie_leibovitz_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/ximulew.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/advanced_cardiac_life_support_provider_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/vukafuwixegojawapuna.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/cisco_asa_firepower_threat_defense_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/92220455757.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/arjun_reddy_movie_bgm_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/8929/5515/files/21777534091.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1369/files/54604281665.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/xenevuvevako.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006315.bin
b2da722aaa7ecbc950a82d1c34888ff262726bdb6b4766decabe6936f5598f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6315 5364 bytes
font_01_sfnt_off0000754c.bin
864fcf7ebf0cf65dc28307eb380c2b645527e30b86371ec619d4616fd3777574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754C 10424 bytes

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