Malicious PDF — malware analysis report

Static analysis result for SHA-256 d675cfa214414c4d…

MALICIOUS

PDF

52.5 KB Created: 2020-08-23 05:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d783cbc42d3d443bb1916f33e6bd6433 SHA-1: d754cb33e126ad2e77cbb3e20df3870c2331f36f SHA-256: d675cfa214414c4dc429ecab156ca21349ee6b813e495d0700b2db28b0cf8672
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to distribute malware or lead users to phishing sites. The document body and embedded links suggest a lure related to downloading modded applications, such as 'asphalt 8 mod apk 2018'. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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=asphalt+8+mod+apk++2018
    • http://files.oceanairandsaltyhair.co.uk/uploads/1/3/0/9/130969889/jotigolopapu.pdf
    • http://bikufel.veteranhillhops.com/uploads/1/3/1/4/131453870/vugadegofid.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/26197241045.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/fe_review.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9622/files/sewomanawejowaxariwalivaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9095/files/fijaxuroluvujiwurufixar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/38062947918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22945880436.pdf
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/97164603256.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/career_test_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/81844092526.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/amalienborg_palace_guided_tours.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_off0000747a.bin
dc4416b439eb6a9765c50d569ff4ab40a520e606264776037b1f217f77c6305c
pdf-font-stream PDF embedded font (sfnt) at offset 0x747A 5676 bytes
font_01_sfnt_off00008794.bin
4d5a2cba9d1172a90ac5d9a4e5436380600010b9dde6309fc34fb2ba2e38a855
pdf-font-stream PDF embedded font (sfnt) at offset 0x8794 9088 bytes
font_02_sfnt_off0000a0b0.bin
7b208382c06eb45b936feac0169b65b5f3ea6e12cc042efe0988d9757fe693f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B0 10528 bytes