Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dba97562f71562b…

MALICIOUS

PDF

48.4 KB Created: 2020-08-08 17:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32c8c607200db25257e7bd169babf27 SHA-1: 75c2482659f0b6c79bc7d2a23c5a0855bac14510 SHA-256: 7dba97562f71562bb2cc572a5b14edd90cbc93b29c563c33605e7263e423ad0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'sistem akuntansi penggajian pdf' and the malicious URL, suggesting a lure to a phishing or malware download site. The ML classifier also strongly indicated maliciousness.

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=sistem+akuntansi+penggajian+pdf
    • http://files.mcgiverncarpentryservices.com/uploads/1/3/2/7/132712163/8440134.pdf
    • http://files.trinitybengals.com/uploads/1/3/2/6/132681836/wozenurufabubixeg.pdf
    • http://files.northwoodselementary.org/uploads/1/3/1/3/131384070/bigerutatuvawijivug.pdf
    • http://files.jackieabeytadesigns.com/uploads/1/3/0/8/130814783/jofijefoj-gopiw.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2956/1495/files/numbers_in_english_1_to_1000_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8829/files/nidovezezolixovo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9072/9377/files/como_sacar_tu_certificado_de_secundaria_en.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/how_to_link_discord_to_twitch.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/request_letter_for_job.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/51770175080.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/2356936437.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/55312662514.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/56399526005.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6370/files/78390814329.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/89246742686.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_off000077c9.bin
a63dc7203ceba2031beaf1d50b83973ffdd0483474384fa5780efc3deacec6ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C9 1696 bytes
font_01_sfnt_off00007ff3.bin
0438cec4ec0027766c1b1acc410fa21c6cfffaa3e0e4202411508c872b70763f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF3 5476 bytes
font_02_sfnt_off00009290.bin
f5997794aa736ca936d9acf4f2f3183e99f9b16eaba9300ade71da9b9aa1b573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9290 9816 bytes

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