Malicious PDF — malware analysis report

Static analysis result for SHA-256 055836c376660144…

MALICIOUS

PDF

46.2 KB Created: 2020-08-04 18:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09826b98dd429fc3eb6bd4d5a5d475b4 SHA-1: 5a16ca470cd92e2e6fdc2e0fd2f4b4f46976b803 SHA-256: 055836c3766601447c276ee34b7ae7e5d618b56f74af3fd673a79a294a153b5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at ttraff.ru. The document body, though obfuscated, contains the same lure text as the malicious URL, suggesting a phishing attempt to drive traffic to malicious sites.

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/wb?keyword=hepatit%20b%20tedavisi%202018%20pdf
    • http://files.speedcubereview.com/uploads/1/3/1/3/131379737/3533723.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/1/6/131606035/fakesijerisaz.pdf
    • http://files.mindyourbodyfitnessandnutrition.com/uploads/1/3/0/7/130740298/4755157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/85829592471.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/paint_jobs_on_1963_chevy_pickups.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/naliwuduketisopupejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/26377289788.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/70512779973.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/68801577260.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/36309430587.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/19609406275.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/43817405714.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/kivilabitonet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82505274200.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/basobataruv.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_off000066ef.bin
74d8d5ef3b8dda1ffcd5b2e545644203f35fd39c3bb5e2b53b4f5d292d375a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EF 5160 bytes
font_01_sfnt_off00007886.bin
2b66f149b9d14d5239bd15642a0f303c766ec63b8db76ce17f5313cde53232f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7886 11456 bytes
font_02_sfnt_off00009c31.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C31 4324 bytes

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