Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f20bacb0736e641…

MALICIOUS

PDF

57.8 KB Created: 2020-08-09 03:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad49f9e6faf221b74b3401493afd772 SHA-1: 8f808c9b8e900fdaf2360fcee194cfd3dc8aae5d SHA-256: 3f20bacb0736e6415874e25eafb45b5e0fc77549bbd02b1d0788c4802901ad17
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=berg+balance+scale+7+item+short+form+version+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO manipulation or to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL as the malicious redirector.

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=berg+balance+scale+7+item+short+form+version+pdf
    • http://files.northhadleysugarshack.com/uploads/1/3/1/3/131379636/ef5587fd.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.danceandcircusarts.com/uploads/1/3/2/6/132681976/lefunu.pdf
    • http://files.southernappalachianworkcenter.org/uploads/1/3/1/3/131384145/893774e.pdf
    • https://cdn.shopify.com/s/files/1/0437/8738/7037/files/62961576585.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9080/files/63514721252.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/nipinofuvibodik.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7746/files/2073351747.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4366/files/loluroka.pdf
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/radial_blur_memes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/fizufagupedegal.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/45389412426.pdf
    • https://cdn.shopify.com/s/files/1/0437/9449/7698/files/prognosis_sepsis.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/islamism_and_islam_bassam_tibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/most_important_synonyms_and_antonyms_for_bank_exam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a141.bin
f0329e1f2209ea2fa73073d25f5723f4c8025201e135d21376469822a8a50d04
pdf-font-stream PDF embedded font (sfnt) at offset 0xA141 5900 bytes
font_01_sfnt_off0000b53b.bin
e746b9632c8934f3e7e68c23acc77d03807755cd34694c876ebad9159dc03309
pdf-font-stream PDF embedded font (sfnt) at offset 0xB53B 10680 bytes