Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9e7db25aeb864e…

MALICIOUS

PDF

50.8 KB Created: 2020-08-09 02:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e9e0701e03a64c8712b19de27448823 SHA-1: 0b0b8a71200a109d61b57d73f62096092ea2ebff SHA-256: dd9e7db25aeb864e7b22c657705e6f0badb08e926c12d7e9a4a83f5f31528df1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on ttraff.ru. This redirector is known to lead to malicious infrastructure. The document body, though heavily obfuscated, also contains the primary malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests a link farm designed to distribute traffic to potentially harmful 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/pify?keyword=cause+and+effect+of+water+pollution+pdf
    • http://files.my-wake-up-call.com/uploads/1/3/0/8/130813528/wesanaje_famemajiz_neraxavelomo_kukolajutoli.pdf
    • http://files.villa-anggrek.com/uploads/1/3/1/3/131379371/difisudenaborex.pdf
    • http://files.crps247.com/uploads/1/3/1/3/131384771/xakilijenibepiba.pdf
    • http://files.danishclubnanaimo.com/uploads/1/3/2/6/132681342/jitededokiso.pdf
    • http://files.daytonsockcompany.com/uploads/1/3/1/6/131606755/1441744.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/78214350362.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zitadeduwifugegumav.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/jafegojimefubif.pdf
    • https://cdn.shopify.com/s/files/1/0450/1143/5670/files/horn_antenna_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/46930509940.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/tajamewezotuvizorere.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/xeziwexijap.pdf
    • https://cdn.shopify.com/s/files/1/0434/4905/7430/files/blender_2._5_materials_and_textures_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/27358467055.pdf
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/fovomarenajinenuluwaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/full_body_massage_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/dimurexidufolevijafolito.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.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_off000087c0.bin
66bda0cde33e5083a99a19ebbeae5d2ea11561c4e634633d8f1b0ac5e2f74d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87C0 5148 bytes
font_01_sfnt_off00009962.bin
86e7fa4872dc238bb545d8f78fe82292f37ad160d18cfd6772e8a6261c57b876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9962 10696 bytes

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