Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b648de3d31b71d…

MALICIOUS

PDF

33.6 KB Created: 2020-08-31 01:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce7c37ca5fd56fd714a55083c79554ee SHA-1: 702207cc7173a0281b0f90425d097a2e91c30ea8 SHA-256: 81b648de3d31b71df6aaa6653f13071685539c5c11be09ec1f7ee0803e756ccb
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a programmer manual, aiming to lure users to a potentially harmful website. The document body and embedded URLs strongly indicate a social engineering attempt to direct users to external content. The ML classifier also flagged this PDF with high confidence.

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/wix?keyword=drayton+lp522+programmer+manual
    • https://static.usrfiles.com/ugd/3eed2b_0ea36baaa32e426298738af2dfa0f018.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2c05fe871cd4a9784b5200d3a77d298.pdf
    • https://static.usrfiles.com/ugd/a44510_768788121a5f4ff0a2ba23b2c26cd3f5.pdf
    • https://static.usrfiles.com/ugd/be19e1_b4cbecba0cbf43f988f16cf3e233cd06.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_d0f8cb89f9484cbe80c125f3d2f1ee3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_61aead6d60824e048b7a574f62f2de6a.pdf
    • https://cdn.shopify.com/s/files/1/0457/7037/5324/files/avakin_life_hack_android.pdf
    • https://cdn.shopify.com/s/files/1/0460/8848/7076/files/android_rotate_bitmap_in_imageview.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/wikowaxaxukajowajiposisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/fifewabatavupulev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/zamuzego.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/zigaperovoluwexoboku.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_off00004554.bin
97f9cad7ef6d826a2900f96f5c77d59831d0c44551a5916a03a86cb8106bffe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4554 5316 bytes
font_01_sfnt_off00005761.bin
362a9a3be2263ee7ba9c88a14e63e63bab1c8a618104ddb5f68382ac7831c95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5761 10040 bytes

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