Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f9258b09164660…

MALICIOUS

PDF

45.0 KB Created: 2020-08-23 05:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea11a760846c4d9a96a3d1a16f0499d5 SHA-1: fe3cd7a37a9d1e5398fbd5afa04266a3a228fe74 SHA-256: a4f9258b09164660eb932e5d0808b823157656991626bb8c5ced44226f2bb1a8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to a URL advertising a "hack apk". Additional heuristics indicate a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is https://ttraff.cc/pify?keyword=frontline+commando+d+day+hack+apk, which is likely used to redirect users to further malicious 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.cc/pify?keyword=frontline+commando+d+day+hack+apk
    • http://meguba.elizabethbaumanart.com/uploads/1/3/0/7/130739197/2801741.pdf
    • http://zivagono.msa29palms.org/uploads/1/3/0/7/130775734/sajunuka_tazijiripekipi.pdf
    • http://lekugufen.2ndkitelife.com/uploads/1/3/1/6/131637814/wovanito_patitavew.pdf
    • http://files.bramasolefarms.com/uploads/1/3/1/1/131164076/fasokikizizawuw-vexefixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/xcode_ios_simulator.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/56685141818.pdf
    • https://cdn.shopify.com/s/files/1/0443/9543/0054/files/6576989009.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/xotaxetavaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/lukunegarukifovaxezawos.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/binary_addition_rules.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/polabenigaluwokaka.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/54035420651.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/vuxedezezifiruweleka.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_off00006583.bin
c6156d07d61500e187d6e1db1fdfd4460c8213887839b379af19ce288fee10ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6583 5044 bytes
font_01_sfnt_off00007677.bin
2cf9caa801d505b9cbfdaebcc87970c3a8985e1969b0c0cf40586dfa5482418a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7677 10372 bytes
font_02_sfnt_off00009938.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9938 4324 bytes