Malicious PDF — malware analysis report

Static analysis result for SHA-256 350988daffc419ef…

MALICIOUS

PDF

49.7 KB Created: 2020-08-09 13:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19e4871f431106437c99e43f86c8aff SHA-1: 98a4e256c1b2ad5716b97194750f9da0e456b759 SHA-256: 350988daffc419efb5a42b6cca7430fba2acf605b219f055573cb168927e20a5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, indicative of an SEO poisoning or link farm attack. One prominent link directs to `https://ttraff.ru/pify?keyword=libro+almas+gemelas+dulce+regina+pdf`, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and other PDF filenames, suggesting a lure to download further content.

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=libro+almas+gemelas+dulce+regina+pdf
    • http://files.mediavisuals.net/uploads/1/3/0/7/130775245/4980268.pdf
    • http://files.edistoislandyouthrec.org/uploads/1/3/0/7/130739234/65a06f35af93c.pdf
    • http://files.pathportfolio.com/uploads/1/3/1/4/131483002/xulelibunupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/nikon_p510_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/penndot_bulletin_14.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/bewevipufulad.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/devakilafifelojepaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/kaxujijitawimefekerub.pdf
    • https://cdn.shopify.com/s/files/1/0434/8503/6706/files/add_path_to_bashrc.pdf
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/jujenorofewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/raw_diaspore_ffxiv_clock.pdf
    • https://cdn.shopify.com/s/files/1/0434/2425/2071/files/vulifemozirexedimozap.pdf
    • https://cdn.shopify.com/s/files/1/0438/2448/0416/files/salixikadar.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/kofisatovogopoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/17569245999.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/wewodukimuvugimisojuro.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/rinukifaduxukuges.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_off00008043.bin
f26dce1b75c92d302c4edc1c77ebbc92249d6f694f640cd670e729ff7ada8ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8043 5556 bytes
font_01_sfnt_off00009316.bin
a63b4815afbf16df1737b9f548bcd938ff1634bdcb2dd06c4179870602dae78d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9316 11380 bytes

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