Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9675adab425e890…

MALICIOUS

PDF

67.2 KB Created: 2020-07-08 18:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c78b97d07d54408f9ce81c0182a07347 SHA-1: 5a1c537d97656d21054753b427be78c97f9da481 SHA-256: d9675adab425e890a14758aefc72a6da1c68aff4437e73203f88bec00ce060ed
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to a 'birthday form' and the malicious URL, suggesting a lure for users to click through to a compromised site. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful destinations.

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/wb?keyword=phantasialand%20geburtstag%20formular%20pdf%202017
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdf
    • http://files.montserratcolome.com/uploads/1/3/1/4/131406295/todekelis.pdf
    • http://files.sallysweetland.com/uploads/1/3/1/4/131438249/e377953a8cde1ef.pdf
    • http://files.scottwarner.me/uploads/1/3/2/6/132696263/wesubagaxazidojapad.pdf
    • http://files.maidtoshineservices.net/uploads/1/3/1/4/131437268/29f33e.pdf
    • http://files.northridgebands.org/uploads/1/3/2/7/132710575/3938141.pdf
    • http://files.phillipsmathandphysics.com/uploads/1/3/2/8/132815742/4577387.pdf
    • http://files.stress-resilience.com/uploads/1/3/1/3/131380001/jewuvemanamusololaze.pdf
    • http://files.rebeccalynnphotography.net/uploads/1/3/0/8/130874518/4840188.pdf
    • http://files.projectufo.org/uploads/1/3/0/7/130739381/4877757.pdf
    • https://dijilavuxiji.files.wordpress.com/2020/06/pamaselejebetovotib.pdf
    • https://jakasizox.files.wordpress.com/2020/06/43627359633.pdf
    • https://wopigumu.files.wordpress.com/2020/07/46564069251.pdf
    • https://ranulidoko.files.wordpress.com/2020/06/99750418578.pdf
    • https://gatemiw90480454.files.wordpress.com/2020/07/durolevirotoxevulopemimek.pdf
    • https://nibefuwubewa.files.wordpress.com/2020/06/kajisapopajivopavek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.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_off0000c485.bin
0242d2a1ab46ee820f696515e2816496d68bb04d3c50754e390b183d38ac5647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 5884 bytes
font_01_sfnt_off0000d85b.bin
90f4b415dec4ba0bb224dbafb1f25107d71f226264961513ec96a118c7ccd634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 11472 bytes

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