Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e550f008fc5cb0c…

MALICIOUS

PDF

40.2 KB Created: 2020-08-21 19:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef36c3da76ddec744792562a1f3cb2bf SHA-1: 96e40ecafaaa6e6945bbd1fa3297ec6a41d0047c SHA-256: 5e550f008fc5cb0ca9f0ac24c2b94a643b8dc8db914a6093211807de81d17317
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of a link farm suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and embedded URLs point to a malicious intent.

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=carpeta+definicion+informatica
    • http://files.sweetshoppeleduc.com/uploads/1/3/0/8/130814169/da69f903c7f.pdf
    • http://files.chcmarketplace.com/uploads/1/3/0/7/130739826/8775886.pdf
    • http://tinafeza.randolphwalters.com/uploads/1/3/1/6/131606490/rijol.pdf
    • http://filit.visedal.org/uploads/1/3/0/7/130738894/logopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/articles_of_association_uk.pdf
    • https://cdn.shopify.com/s/files/1/0437/6474/4343/files/knowing_god_by_name_david_wilkerson.pdf
    • https://cdn.shopify.com/s/files/1/0428/9134/6079/files/nucleophilic_acyl_substitution_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2332/files/character_development_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/blood_groups_and_red_cell_antigens.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/grey_s_anatomy_episode_guide_derek_dies.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/bulavup.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/agile_organization.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/breckenridge_weather_15_day_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6929/files/91374662276.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9086/files/66081440555.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/air_pollution_essay_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0438/2759/3376/files/catholic_study_bible_donald_senior.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_off00006087.bin
985320fa10f12368caeedc0c3c0716604f2ca7ab9c107d81b2ecfed1c535ecc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6087 4996 bytes
font_01_sfnt_off0000716d.bin
549aa2cfc93f9ec8a3681e3b0788c83656610118a949989f11c2b5110076dca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 10252 bytes

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