Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcee85f173740cc…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 10:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f80fe9689967bc6a0019e8cb23756a6 SHA-1: ef1c235cbb26548b5ec358fd366d2d980514171d SHA-256: 5dcee85f173740cc3d5f8fcdb75da60c76adafeef61d1bff18769fc0a9e7bd38
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to external PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest an attempt to lure users to malicious sites, potentially for further exploitation or phishing.

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=gregor+samson+skullgirls
    • http://sesiv.capptivatebeacons.com.au/uploads/1/3/2/6/132682924/102270a949ec.pdf
    • http://files.jvrealtyandhomeloans.com/uploads/1/3/1/4/131452949/3adb9a1.pdf
    • http://files.veacogroup.com/uploads/1/3/1/3/131380292/katujawapafita-lovuva.pdf
    • http://files.charlottehighersoriginalart.net/uploads/1/3/1/3/131397946/cca53.pdf
    • http://sepoz.bridgeyoungadults.com/uploads/1/3/1/6/131607254/vesubi-lakutajulib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1716/7267/files/todotibinolake.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6084/files/purchase_agreement_addendum.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7162/files/zikoreloleromi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/gogogofuwelabupegejixaxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/82564115064.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/arya_samaj_havan_mantra.pdf
    • https://cdn.shopify.com/s/files/1/0437/2217/8710/files/button_css_media_queries.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/crowder_i_am.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/womigiwakeboli.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/tukujutagani.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2568/files/85818844977.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/2016-_2017_uspap.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_off00005854.bin
e98d2ec610a191d2bc33847234ec3f094efe6a4b8aff792cf559d4b39cf965ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5854 3176 bytes
font_01_sfnt_off000063b0.bin
df6198c5b25097ce6822ebb51a6351b6109eb415cc5339c8bd86d307ddfaed19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B0 5100 bytes
font_02_sfnt_off000074fc.bin
a573e6b276e0f6a4bfe19adbcff84eeccacb6df7387a70a92b00a3a7075b23f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FC 10352 bytes

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