Malicious PDF — malware analysis report

Static analysis result for SHA-256 68899a16b01c5df6…

MALICIOUS

PDF

62.2 KB Created: 2020-08-11 17:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8133ae99d6ada2cbc54c34d32fc142fc SHA-1: e37b7e13cbd6747e5037bc696a92d85a35a70f16 SHA-256: 68899a16b01c5df6549b629f60ca58bf74ec9ff91ce187e79cf6d3a4f0a40a25
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be link farm infrastructure, with a critical heuristic identifying a malicious redirector. The document body, though partially garbled, contains text related to PDF downloads and a URL that matches the malicious redirector. This suggests the document is designed to drive traffic to malicious sites, potentially for SEO manipulation or to host phishing content.

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=abwab+us+sarf+pdf+free+download
    • http://files.virginiapolicyreview.org/uploads/1/3/0/7/130776828/284442f3427c3a.pdf
    • http://files.leididonna.com/uploads/1/3/0/8/130874585/8698881.pdf
    • http://vozex.southcollegeasp.org/uploads/1/3/1/1/131164250/4516511.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6487/7475/files/how_to_extend_adobe_illustrator_trial.pdf
    • https://cdn.shopify.com/s/files/1/0435/9087/7339/files/depomoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/budasajolaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/davixoligiwonosenu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0798/1214/files/jojimesozolepirijata.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/tilawojolutosaluxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/bottle_rocket_fin_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/auxiliary_verb_examples_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/zufabenuxabemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1363/5226/files/hallelujah_paroles_franais.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/67454288688.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9622/files/palaxetejinukoraviwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/87556042921.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ae97.bin
41b793a01f1921ebdf502cef6dc74c8155977e147505c73be93f35d936f36f34		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAE97 26596 bytes
font_00_sfnt_off00006445.bin
d4928e9431c2bbe7dde01c323647cfcd9fc3f0eaa69d3fd4784ccb70e312fad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 5012 bytes
font_01_sfnt_off00007558.bin
dc5b970635f1baf4e6b991cc07bbfc56094f585292092a0fe12e90bb43352434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7558 6336 bytes
font_02_sfnt_off00008a2c.bin
a1dd150823e8a578e38b5a562df1ee894fbf1e8ec4a10ddc15a3cb1a25eb6270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2C 10676 bytes
font_04_sfnt_off0000dd26.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 4324 bytes

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