Malicious PDF — malware analysis report

Static analysis result for SHA-256 6612ea6c55a40e27…

MALICIOUS

PDF

55.4 KB Created: 2020-07-28 11:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c94b997ba39949ebc6288a30f141482 SHA-1: d857fefd6355a868ac01a619f00987db4ba3b36d SHA-256: 6612ea6c55a40e27723f68e9188a4f48d5df734a391ff5235e0042b2fc1e365a
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 of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or traffic redirection. One prominent URL, 'https://ttraff.ru/pify?keyword=laboratory+skills+checkup+4+identifying+errors+answers', is flagged as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'laboratory skills checkup answers'.

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=laboratory+skills+checkup+4+identifying+errors+answers
    • http://files.spartafbo.com/uploads/1/3/1/3/131383889/zemokevirisebiv_gaperazefame_rivabiditu.pdf
    • http://files.bluemountainwine.com/uploads/1/3/1/4/131407977/3d6cd85253.pdf
    • http://files.sassortingandstaging.com/uploads/1/3/0/9/130969509/b693e2d7891f.pdf
    • http://files.grip-potential.com/uploads/1/3/1/8/131856713/fidub-giralawujaz-kajexene-kadat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/josixiviri.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/11672668211.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/66749757335.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/18179212753.pdf
    • https://cdn.shopify.com/s/files/1/0437/6929/9098/files/33433016514.pdf
    • https://cdn.shopify.com/s/files/1/0429/5622/6716/files/zegirusudiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/rinijubixizigu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/33413812228.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/najaxosetovasetanukilivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/48768716043.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/parubu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3557/files/gejofakubisaxiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwakuda.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/85748382678.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_off00008eb5.bin
9f8e0aff96f689a52ceaa56fe3236568abcb7f135047ef1eb76ff492cca8a3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB5 5728 bytes
font_01_sfnt_off0000a246.bin
cf3cdc9a0fd7094e874c4c7b85e56e5ce916acac85236fdd7db2a0b1f3a37e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA246 14808 bytes

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