Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f45330d3e4e1573…

MALICIOUS

PDF

53.8 KB Created: 2020-08-25 14:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8900630e431db89ade71e834866dccf SHA-1: aefaaa223d8cfd458f25d2c8c44bbb4ab3327567 SHA-256: 1f45330d3e4e157359447acf16674c93d438ef64c4354d29db3f3f7f1f4fc21d
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lure victims. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware-hosting site.

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=budesonida+dosis+pediatrica+pdf
    • http://files.thejadebeagle.com/uploads/1/3/0/8/130813458/rujujonivez-bipakawamemanit-bilug-kerobixote.pdf
    • http://bixax.byashleylauren.com/uploads/1/3/2/6/132683001/viwesoropuf_vuxiso.pdf
    • http://vuketoxok.17southstreet.com/uploads/1/3/1/4/131438268/tugidekozo.pdf
    • http://files.freedfamilyfarm.com/uploads/1/3/0/9/130969370/kosutafopuwod.pdf
    • http://nugejam.barbelldancer.com/uploads/1/3/2/7/132740873/b33162bdebda5c.pdf
    • https://cdn.shopify.com/s/files/1/0435/9743/0941/files/amory_wars_comics.pdf
    • https://cdn.shopify.com/s/files/1/0438/5262/8118/files/gikoloven.pdf
    • https://cdn.shopify.com/s/files/1/0434/6272/1688/files/backgammon_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4408/files/86265120248.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/jafabevemigibus.pdf
    • https://cdn.shopify.com/s/files/1/0438/1242/1789/files/tipos_de_capacitores_electroliticos.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7798/files/broken_hearted_girl_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/mujab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/42996505523.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/40544514185.pdf
    • https://cdn.shopify.com/s/files/1/0435/3084/6363/files/vigejogugin.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/nexevarirov.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_off00007f8d.bin
38de68e7f2192b1122ef7d846e71aee2ceace35da05244056e958241a0aa232f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8D 5048 bytes
font_01_sfnt_off000090bd.bin
291e3111663b047117874f00ae27d2720545593e600d8a626b2842fc39024585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90BD 14112 bytes
font_02_sfnt_off0000bc3a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3A 4324 bytes

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