Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a436fc8bd312eec…

MALICIOUS

PDF

48.0 KB Created: 2020-08-04 07:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edce36a079fc4fb46229f8924ad7bc71 SHA-1: abd73ae70c1957484665e26a9ce22b8ff0debfdc SHA-256: 1a436fc8bd312eec7ced98f61f8e7058faf0bf2882e714185ecc3e93bda18343
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=calendar+2020+pdf+kalnirnay'. This indicates the document's primary purpose is to lure the user to a malicious site. The PDF also contains a large number of embedded links, many hosted on Shopify, which is characteristic of SEO link farm abuse to obscure the malicious destination. No scripts were extracted, but the embedded URLs and the ML classifier strongly suggest a phishing or redirection attack.

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=calendar+2020+pdf+kalnirnay
    • http://files.thorinrealestategroup.com/uploads/1/3/1/6/131607565/25e836af2.pdf
    • http://files.beyondstrengthmaine.com/uploads/1/3/2/6/132696280/lamutesirabogurofaja.pdf
    • http://segado.confistreet.com/uploads/1/3/1/3/131384771/ferax.pdf
    • http://files.meteorcruise.com/uploads/1/3/1/4/131454389/jivapabidevo.pdf
    • http://files.tmfgala.org/uploads/1/3/0/7/130775232/nulag-mexafofipof-pudanijivumakez.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/wotopoxavepeduzejigoka.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/93182058308.pdf
    • https://cdn.shopify.com/s/files/1/0440/5883/7142/files/what_is_a_slug_in_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/zakavawudazumox.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/10248532555.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/45822474652.pdf
    • https://cdn.shopify.com/s/files/1/0436/4717/2768/files/disokogotudesulibi.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/rimoxupiwuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/17809416500.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/34893829595.pdf
    • https://cdn.shopify.com/s/files/1/0428/7958/2374/files/weather_underground_iowa_city.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006758.bin
2a45288f1ad3c92dca681ea568c6d7b1f53b4dddd6def634870e4972d242bec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6758 5200 bytes
font_01_sfnt_off00007921.bin
3f6a6bf18cc7e575d4cb1ae450b5e55065ec7ab2504062d2962036c56f5f2434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 10068 bytes
font_02_sfnt_off00009bd8.bin
f65bd31dfe82ad648fb73c9f110f832639490edb2ebaefd9f07fb7d5a0e17e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD8 6668 bytes

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