Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba7a0cad397bf0b…

MALICIOUS

PDF

42.7 KB Created: 2020-08-25 02:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b08436eb1951a0cbd09f81dd6eaf4da SHA-1: 48134d937bd72d37d223ef4b4420fd057fc3ff62 SHA-256: 0ba7a0cad397bf0b21ef916e663cd3bcfeebc6070926f13ac700e067dfecdd42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links to other PDF files. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Asure id exchange datasheet'. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a malicious 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.ru/pify?keyword=asure+id+exchange+datasheet
    • http://zuzusit.maryzambello.com/uploads/1/3/1/6/131606666/8190874.pdf
    • http://mapojuki.olgaklosowski.com/uploads/1/3/0/8/130813306/9068635.pdf
    • http://files.snugnut.com/uploads/1/3/1/0/131070035/6416fab392091ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/biology_o_level_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/black_and_decker_grass_hog_manual.pdf
    • https://cdn.shopify.com/s/files/1/0466/3371/3829/files/cross_platform_games_xbox_one_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/accounting_for_management_control_emmanuel.pdf
    • https://cdn.shopify.com/s/files/1/0448/2279/0305/files/world_map_with_names_of_countries.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1167/files/88761924186.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/wixudaxufuvupusogavi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1560/9243/files/allianz_travel_insurance_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0433/8830/5558/files/1828247783.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/kafeti.pdf
    • https://cdn.shopify.com/s/files/1/0440/7453/3014/files/65736792289.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/clearface_bold_font.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/86132101214.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/how_to_use_vimdiff.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/48380228581.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000688a.bin
45a8b2d5c9096dcf1fd5d641273a49eb630b895e7a19c4181c7a488bc59469f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688A 5228 bytes
font_01_sfnt_off00007a47.bin
d1a9fad8ab8a38772ab8eacfccca0596c3424e69c173f1e0797a78ed8bfa0dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A47 10496 bytes

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