Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b156710e72c28ab…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 17:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb82aa5e76d6274c699531acfccebe8 SHA-1: 695088e67a9dfd098c7da666b2deab7d46888d5b SHA-256: 0b156710e72c28ab1ced7f5f1fc1347ede68df7efc9da8ab241b7be13886e714
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure, presenting itself as a 'Figure caption report'. The presence of embedded URLs and the malicious redirector strongly suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=figure+caption+report
    • http://files.forestvilleanglican.com/uploads/1/3/1/4/131453967/pevodulibomonalavaxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0445/5153/6799/files/watauga_county_roads.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/gawetemujitawajego.pdf
    • https://cdn.shopify.com/s/files/1/0430/0914/7043/files/hunter_hayes_wanted_song.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/63838288742.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/janivedajesusetojoketi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5229/files/assam_tet_2020_admit_card_download.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_off00005b8c.bin
d2f4b23515d9dd3c8ad0ce8e05a41d3c22a0df676878209e344f0575546c4d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8C 4728 bytes
font_01_sfnt_off00006bac.bin
6467913642c48db2be8d35bee35eb4ea96e003a7b43e379e224b83832200699a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAC 9928 bytes
font_02_sfnt_off00008da2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA2 4324 bytes