Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b75933a98d01ed…

MALICIOUS

PDF

37.2 KB Created: 2020-08-13 23:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd58ddd84c16eb72a24ea48cdf4d120 SHA-1: e2e98972e0ee3913ed532d9cffc83d895720c794 SHA-256: 86b75933a98d01ed9f0ab09eb39352856e4226c0d325e04b9a056231a7dbfdc7
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a redirector service, which is a known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'free Bible app'. The presence of numerous external PDF links, many pointing to Shopify, suggests an attempt to create a link farm or distribute further malicious content. 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=nkjv+bible+free++app
    • http://filizowi.pepperprep.com/uploads/1/3/0/8/130814237/471dc55e15.pdf
    • http://files.sairllc.com/uploads/1/3/1/3/131398419/012b97.pdf
    • http://files.minniemightietopics.com/uploads/1/3/1/0/131070786/8027942.pdf
    • http://kevuli.chalkboardbullies.com/uploads/1/3/1/3/131380600/5106181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/73251588362.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/96905273792.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/mechanical_measurements_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/brick_by_boring_brick_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0471/files/81501830778.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/memilakipeku.pdf
    • https://cdn.shopify.com/s/files/1/0432/1784/6432/files/94699754704.pdf
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/oxford_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/biological_molecules_a_level.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/tewetanuberekuxin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/humble_and_kind_ukulele_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/xafafegomibadajod.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_off000053da.bin
50ab6b4781c84dd02280d26becb7242c91304144365a8dc669dbe76cfbf14eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53DA 5024 bytes
font_01_sfnt_off00006513.bin
e8849983c533bbb31a1ada94c2ed3dc39d7496d134effb78abe77d2cea2eab7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 10296 bytes

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